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| <h1 title="Package" class="title">Package org.apache.drill.exec.vector.accessor</h1> |
| <div class="docSummary"> |
| <div class="block">Provides a light-weight, simplified set of column readers and writers that |
| can be plugged into a variety of row-level readers and writers.</div> |
| </div> |
| <p>See: <a href="#package.description">Description</a></p> |
| </div> |
| <div class="contentContainer"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <table class="typeSummary" border="0" cellpadding="3" cellspacing="0" summary="Interface Summary table, listing interfaces, and an explanation"> |
| <caption><span>Interface Summary</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Interface</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tbody> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ArrayReader.html" title="interface in org.apache.drill.exec.vector.accessor">ArrayReader</a></td> |
| <td class="colLast"> |
| <div class="block">Generic array reader.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ArrayWriter.html" title="interface in org.apache.drill.exec.vector.accessor">ArrayWriter</a></td> |
| <td class="colLast"> |
| <div class="block">Writer for values into an array.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnReader.html" title="interface in org.apache.drill.exec.vector.accessor">ColumnReader</a></td> |
| <td class="colLast"> |
| <div class="block">Base interface for all column readers, defining a generic set of methods |
| that all readers provide.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnReaderIndex.html" title="interface in org.apache.drill.exec.vector.accessor">ColumnReaderIndex</a></td> |
| <td class="colLast"> |
| <div class="block">The reader structure is heavily recursive.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnWriter.html" title="interface in org.apache.drill.exec.vector.accessor">ColumnWriter</a></td> |
| <td class="colLast"> |
| <div class="block">Generic information about a column writer including: |
| |
| Metadata |
| Write position information about a writer needed by a vector overflow |
| implementation.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnWriterIndex.html" title="interface in org.apache.drill.exec.vector.accessor">ColumnWriterIndex</a></td> |
| <td class="colLast"> |
| <div class="block">A Drill record batch consists of a variety of vectors, including maps and lists.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/DictReader.html" title="interface in org.apache.drill.exec.vector.accessor">DictReader</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/DictWriter.html" title="interface in org.apache.drill.exec.vector.accessor">DictWriter</a></td> |
| <td class="colLast"> |
| <div class="block">Physically the writer is an array writer with special tuple writer as its element.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/KeyAccessor.html" title="interface in org.apache.drill.exec.vector.accessor">KeyAccessor</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ObjectReader.html" title="interface in org.apache.drill.exec.vector.accessor">ObjectReader</a></td> |
| <td class="colLast"> |
| <div class="block">Defines a reader to get values for value vectors using |
| a simple, uniform interface modeled after a JSON object.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ObjectWriter.html" title="interface in org.apache.drill.exec.vector.accessor">ObjectWriter</a></td> |
| <td class="colLast"> |
| <div class="block">Represents a column within a tuple.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ScalarReader.html" title="interface in org.apache.drill.exec.vector.accessor">ScalarReader</a></td> |
| <td class="colLast"> |
| <div class="block">Defines a reader to obtain values from value vectors using |
| a simple, uniform interface.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ScalarWriter.html" title="interface in org.apache.drill.exec.vector.accessor">ScalarWriter</a></td> |
| <td class="colLast"> |
| <div class="block">Represents a scalar value: a required column, a nullable column, |
| or one element within an array of scalars.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/SqlAccessor.html" title="interface in org.apache.drill.exec.vector.accessor">SqlAccessor</a></td> |
| <td class="colLast"> |
| <div class="block">Column-data accessor that implements JDBC's Java-null--when--SQL-NULL mapping.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/TupleReader.html" title="interface in org.apache.drill.exec.vector.accessor">TupleReader</a></td> |
| <td class="colLast"> |
| <div class="block">Interface for reading from tuples (rows or maps).</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/TupleWriter.html" title="interface in org.apache.drill.exec.vector.accessor">TupleWriter</a></td> |
| <td class="colLast"> |
| <div class="block">Writer for a tuple.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ValueWriter.html" title="interface in org.apache.drill.exec.vector.accessor">ValueWriter</a></td> |
| <td class="colLast"> |
| <div class="block">Writer for a scalar value.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/VariantReader.html" title="interface in org.apache.drill.exec.vector.accessor">VariantReader</a></td> |
| <td class="colLast"> |
| <div class="block">Reader for a Drill "union vector." The union vector is presented |
| as a reader over a set of variants.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/VariantWriter.html" title="interface in org.apache.drill.exec.vector.accessor">VariantWriter</a></td> |
| <td class="colLast"> |
| <div class="block">Writer for a Drill "union vector." The union vector is presented |
| as a writer over a set of variants.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/VariantWriter.VariantWriterListener.html" title="interface in org.apache.drill.exec.vector.accessor">VariantWriter.VariantWriterListener</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/WriterPosition.html" title="interface in org.apache.drill.exec.vector.accessor">WriterPosition</a></td> |
| <td class="colLast"> |
| <div class="block">Position information about a writer used during vector overflow.</div> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </li> |
| <li class="blockList"> |
| <table class="typeSummary" border="0" cellpadding="3" cellspacing="0" summary="Class Summary table, listing classes, and an explanation"> |
| <caption><span>Class Summary</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Class</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tbody> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/AbstractKeyAccessor.html" title="class in org.apache.drill.exec.vector.accessor">AbstractKeyAccessor</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/AbstractSqlAccessor.html" title="class in org.apache.drill.exec.vector.accessor">AbstractSqlAccessor</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/BigIntAccessor.html" title="class in org.apache.drill.exec.vector.accessor">BigIntAccessor</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/BitAccessor.html" title="class in org.apache.drill.exec.vector.accessor">BitAccessor</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/BoundCheckingAccessor.html" title="class in org.apache.drill.exec.vector.accessor">BoundCheckingAccessor</a></td> |
| <td class="colLast"> |
| <div class="block">A decorating accessor that returns null for indices that is beyond underlying vector's capacity.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors</a></td> |
| <td class="colLast"> |
| <div class="block">Basic accessors for most Drill vector types and modes.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.BigIntColumnReader.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.BigIntColumnReader</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.BigIntColumnWriter.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.BigIntColumnWriter</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.DateColumnReader.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.DateColumnReader</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.DateColumnWriter.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.DateColumnWriter</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.Decimal18ColumnReader.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.Decimal18ColumnReader</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.Decimal18ColumnWriter.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.Decimal18ColumnWriter</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.Decimal28SparseColumnReader.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.Decimal28SparseColumnReader</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.Decimal28SparseColumnWriter.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.Decimal28SparseColumnWriter</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.Decimal38SparseColumnReader.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.Decimal38SparseColumnReader</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.Decimal38SparseColumnWriter.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.Decimal38SparseColumnWriter</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.Decimal9ColumnReader.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.Decimal9ColumnReader</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.Decimal9ColumnWriter.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.Decimal9ColumnWriter</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.Float4ColumnReader.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.Float4ColumnReader</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.Float4ColumnWriter.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.Float4ColumnWriter</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.Float8ColumnReader.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.Float8ColumnReader</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.Float8ColumnWriter.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.Float8ColumnWriter</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.IntColumnReader.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.IntColumnReader</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.IntColumnWriter.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.IntColumnWriter</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.IntervalColumnReader.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.IntervalColumnReader</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.IntervalColumnWriter.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.IntervalColumnWriter</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.IntervalDayColumnReader.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.IntervalDayColumnReader</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.IntervalDayColumnWriter.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.IntervalDayColumnWriter</a></td> |
| <td class="colLast"> </td> |
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| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.IntervalYearColumnReader.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.IntervalYearColumnReader</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.IntervalYearColumnWriter.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.IntervalYearColumnWriter</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.SmallIntColumnReader.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.SmallIntColumnReader</a></td> |
| <td class="colLast"> </td> |
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| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.SmallIntColumnWriter.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.SmallIntColumnWriter</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.TimeColumnReader.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.TimeColumnReader</a></td> |
| <td class="colLast"> </td> |
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| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.TimeColumnWriter.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.TimeColumnWriter</a></td> |
| <td class="colLast"> </td> |
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| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.TimeStampColumnReader.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.TimeStampColumnReader</a></td> |
| <td class="colLast"> </td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.TinyIntColumnReader.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.TinyIntColumnReader</a></td> |
| <td class="colLast"> </td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.TinyIntColumnWriter.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.TinyIntColumnWriter</a></td> |
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| <td class="colLast"> </td> |
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| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.UInt1ColumnWriter.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.UInt1ColumnWriter</a></td> |
| <td class="colLast"> </td> |
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| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.UInt2ColumnReader.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.UInt2ColumnReader</a></td> |
| <td class="colLast"> </td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.UInt4ColumnWriter.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.UInt4ColumnWriter</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.UInt8ColumnReader.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.UInt8ColumnReader</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.UInt8ColumnWriter.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.UInt8ColumnWriter</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.Var16CharColumnReader.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.Var16CharColumnReader</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessors.Var16CharColumnWriter.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessors.Var16CharColumnWriter</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnAccessorUtils.html" title="class in org.apache.drill.exec.vector.accessor">ColumnAccessorUtils</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/DateAccessor.html" title="class in org.apache.drill.exec.vector.accessor">DateAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/Decimal18Accessor.html" title="class in org.apache.drill.exec.vector.accessor">Decimal18Accessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/Decimal28DenseAccessor.html" title="class in org.apache.drill.exec.vector.accessor">Decimal28DenseAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/Decimal28SparseAccessor.html" title="class in org.apache.drill.exec.vector.accessor">Decimal28SparseAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/Decimal38DenseAccessor.html" title="class in org.apache.drill.exec.vector.accessor">Decimal38DenseAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/Decimal38SparseAccessor.html" title="class in org.apache.drill.exec.vector.accessor">Decimal38SparseAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/Decimal9Accessor.html" title="class in org.apache.drill.exec.vector.accessor">Decimal9Accessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/Float4Accessor.html" title="class in org.apache.drill.exec.vector.accessor">Float4Accessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/Float8Accessor.html" title="class in org.apache.drill.exec.vector.accessor">Float8Accessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/GenericAccessor.html" title="class in org.apache.drill.exec.vector.accessor">GenericAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/IntAccessor.html" title="class in org.apache.drill.exec.vector.accessor">IntAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/IntervalAccessor.html" title="class in org.apache.drill.exec.vector.accessor">IntervalAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/IntervalDayAccessor.html" title="class in org.apache.drill.exec.vector.accessor">IntervalDayAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/IntervalYearAccessor.html" title="class in org.apache.drill.exec.vector.accessor">IntervalYearAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/KeyAccessors.html" title="class in org.apache.drill.exec.vector.accessor">KeyAccessors</a></td> |
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| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/KeyAccessors.BooleanKeyAccessor.html" title="class in org.apache.drill.exec.vector.accessor">KeyAccessors.BooleanKeyAccessor</a></td> |
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| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/KeyAccessors.BytesKeyAccessor.html" title="class in org.apache.drill.exec.vector.accessor">KeyAccessors.BytesKeyAccessor</a></td> |
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| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/KeyAccessors.DateKeyAccessor.html" title="class in org.apache.drill.exec.vector.accessor">KeyAccessors.DateKeyAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/KeyAccessors.DecimalKeyAccessor.html" title="class in org.apache.drill.exec.vector.accessor">KeyAccessors.DecimalKeyAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/KeyAccessors.IntegerKeyAccessor.html" title="class in org.apache.drill.exec.vector.accessor">KeyAccessors.IntegerKeyAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/KeyAccessors.LongKeyAccessor.html" title="class in org.apache.drill.exec.vector.accessor">KeyAccessors.LongKeyAccessor</a></td> |
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| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/KeyAccessors.PeriodKeyAccessor.html" title="class in org.apache.drill.exec.vector.accessor">KeyAccessors.PeriodKeyAccessor</a></td> |
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| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/KeyAccessors.StringKeyAccessor.html" title="class in org.apache.drill.exec.vector.accessor">KeyAccessors.StringKeyAccessor</a></td> |
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| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/KeyAccessors.TimeKeyAccessor.html" title="class in org.apache.drill.exec.vector.accessor">KeyAccessors.TimeKeyAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/KeyAccessors.TimestampKeyAccessor.html" title="class in org.apache.drill.exec.vector.accessor">KeyAccessors.TimestampKeyAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/NullableBigIntAccessor.html" title="class in org.apache.drill.exec.vector.accessor">NullableBigIntAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/NullableBitAccessor.html" title="class in org.apache.drill.exec.vector.accessor">NullableBitAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/NullableDateAccessor.html" title="class in org.apache.drill.exec.vector.accessor">NullableDateAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/NullableDecimal18Accessor.html" title="class in org.apache.drill.exec.vector.accessor">NullableDecimal18Accessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/NullableDecimal28DenseAccessor.html" title="class in org.apache.drill.exec.vector.accessor">NullableDecimal28DenseAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/NullableDecimal28SparseAccessor.html" title="class in org.apache.drill.exec.vector.accessor">NullableDecimal28SparseAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/NullableDecimal38DenseAccessor.html" title="class in org.apache.drill.exec.vector.accessor">NullableDecimal38DenseAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/NullableDecimal38SparseAccessor.html" title="class in org.apache.drill.exec.vector.accessor">NullableDecimal38SparseAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/NullableDecimal9Accessor.html" title="class in org.apache.drill.exec.vector.accessor">NullableDecimal9Accessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/NullableIntervalDayAccessor.html" title="class in org.apache.drill.exec.vector.accessor">NullableIntervalDayAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/NullableIntervalYearAccessor.html" title="class in org.apache.drill.exec.vector.accessor">NullableIntervalYearAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/NullableSmallIntAccessor.html" title="class in org.apache.drill.exec.vector.accessor">NullableSmallIntAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/NullableTimeAccessor.html" title="class in org.apache.drill.exec.vector.accessor">NullableTimeAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/NullableTimeStampAccessor.html" title="class in org.apache.drill.exec.vector.accessor">NullableTimeStampAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/NullableUInt1Accessor.html" title="class in org.apache.drill.exec.vector.accessor">NullableUInt1Accessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/NullableUInt2Accessor.html" title="class in org.apache.drill.exec.vector.accessor">NullableUInt2Accessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/NullableUInt4Accessor.html" title="class in org.apache.drill.exec.vector.accessor">NullableUInt4Accessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/NullableUInt8Accessor.html" title="class in org.apache.drill.exec.vector.accessor">NullableUInt8Accessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/NullableVar16CharAccessor.html" title="class in org.apache.drill.exec.vector.accessor">NullableVar16CharAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/NullableVarBinaryAccessor.html" title="class in org.apache.drill.exec.vector.accessor">NullableVarBinaryAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/NullableVarCharAccessor.html" title="class in org.apache.drill.exec.vector.accessor">NullableVarCharAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/NullableVarDecimalAccessor.html" title="class in org.apache.drill.exec.vector.accessor">NullableVarDecimalAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/SmallIntAccessor.html" title="class in org.apache.drill.exec.vector.accessor">SmallIntAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/TimeAccessor.html" title="class in org.apache.drill.exec.vector.accessor">TimeAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/TimeStampAccessor.html" title="class in org.apache.drill.exec.vector.accessor">TimeStampAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/TinyIntAccessor.html" title="class in org.apache.drill.exec.vector.accessor">TinyIntAccessor</a></td> |
| <td class="colLast"> </td> |
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| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/UInt1Accessor.html" title="class in org.apache.drill.exec.vector.accessor">UInt1Accessor</a></td> |
| <td class="colLast"> </td> |
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| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/UInt2Accessor.html" title="class in org.apache.drill.exec.vector.accessor">UInt2Accessor</a></td> |
| <td class="colLast"> </td> |
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| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/UInt4Accessor.html" title="class in org.apache.drill.exec.vector.accessor">UInt4Accessor</a></td> |
| <td class="colLast"> </td> |
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| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/UInt8Accessor.html" title="class in org.apache.drill.exec.vector.accessor">UInt8Accessor</a></td> |
| <td class="colLast"> </td> |
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| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/UnionSqlAccessor.html" title="class in org.apache.drill.exec.vector.accessor">UnionSqlAccessor</a></td> |
| <td class="colLast"> </td> |
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| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/Var16CharAccessor.html" title="class in org.apache.drill.exec.vector.accessor">Var16CharAccessor</a></td> |
| <td class="colLast"> </td> |
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| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/VarBinaryAccessor.html" title="class in org.apache.drill.exec.vector.accessor">VarBinaryAccessor</a></td> |
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| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/VarCharAccessor.html" title="class in org.apache.drill.exec.vector.accessor">VarCharAccessor</a></td> |
| <td class="colLast"> </td> |
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| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/VarDecimalAccessor.html" title="class in org.apache.drill.exec.vector.accessor">VarDecimalAccessor</a></td> |
| <td class="colLast"> </td> |
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| </li> |
| <li class="blockList"> |
| <table class="typeSummary" border="0" cellpadding="3" cellspacing="0" summary="Enum Summary table, listing enums, and an explanation"> |
| <caption><span>Enum Summary</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Enum</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tbody> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ObjectType.html" title="enum in org.apache.drill.exec.vector.accessor">ObjectType</a></td> |
| <td class="colLast"> |
| <div class="block">Type of writer.</div> |
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| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ValueType.html" title="enum in org.apache.drill.exec.vector.accessor">ValueType</a></td> |
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| <div class="block">Represents the primitive types supported to read and write data |
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| </tr> |
| </tbody> |
| </table> |
| </li> |
| <li class="blockList"> |
| <table class="typeSummary" border="0" cellpadding="3" cellspacing="0" summary="Exception Summary table, listing exceptions, and an explanation"> |
| <caption><span>Exception Summary</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Exception</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tbody> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/InvalidAccessException.html" title="class in org.apache.drill.exec.vector.accessor">InvalidAccessException</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/InvalidConversionError.html" title="class in org.apache.drill.exec.vector.accessor">InvalidConversionError</a></td> |
| <td class="colLast"> |
| <div class="block">Raised when a conversion from one type to another is supported at |
| setup type, but a value provided at runtime is not valid for that |
| conversion.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/TupleWriter.UndefinedColumnException.html" title="class in org.apache.drill.exec.vector.accessor">TupleWriter.UndefinedColumnException</a></td> |
| <td class="colLast"> |
| <div class="block">Unchecked exception thrown when attempting to access a column writer by |
| name for an undefined columns.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/drill/exec/vector/accessor/UnsupportedConversionError.html" title="class in org.apache.drill.exec.vector.accessor">UnsupportedConversionError</a></td> |
| <td class="colLast"> |
| <div class="block">Raised when a column accessor reads or writes the value using the wrong |
| Java type (which may indicate an data inconsistency in the input data.)</div> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </li> |
| </ul> |
| <a name="package.description"> |
| <!-- --> |
| </a> |
| <h2 title="Package org.apache.drill.exec.vector.accessor Description">Package org.apache.drill.exec.vector.accessor Description</h2> |
| <div class="block">Provides a light-weight, simplified set of column readers and writers that |
| can be plugged into a variety of row-level readers and writers. The classes |
| and interfaces here form a framework for accessing rows and columns, but do |
| not provide the code to build accessors for a given row batch. This code is |
| meant to be generic, but the first (and, thus far, only) use is with the test |
| framework for the java-exec project. That one implementation is specific to |
| unit tests, but the accessor framework could easily be used for other |
| purposes as well. |
| |
| <h4>Vector Overflow Handling</h4> |
| |
| The writers provide integrated support for detecting and handling vector |
| overflow. Overflow occurs when a value exceeds some maximum, such as the |
| 16MB block size in Netty. Overflow handling consists of replacing the |
| "full" vector with a new, empty vector as part of a new batch. Overflow |
| handing code must copy partially written values from the "overflow" row |
| to the new vectors. The classes here do not provide overflow handling, |
| rather they provide the framework on top of which overflow handling can be |
| built by a higher level of abstraction. |
| |
| <h4>JSON-Like Model</h4> |
| |
| The object reader and writer provide a generic, JSON-like interface |
| to allow any valid combination of readers or writers (generically |
| accessors):<pre><code> |
| row : tuple |
| tuple : (name column) * |
| column : scalar obj | array obj | tuple obj |
| scalar obj : scalar accessor |
| array obj : array accessor |
| array accessor : element accessor |
| tuple obj : tuple</code></pre> |
| <p> |
| As seen above, the accessor tree starts with a tuple (a row in the form of |
| a class provided by the consumer.) Each column in the tuple is represented |
| by an object accesor. That object accessor contains a scalar, tuple or array |
| accessor. This models Drill's JSON structure: a row can have a list of lists |
| of tuples that contains lists of ints, say. |
| |
| <h4>Comparison with Previous Vector Readers and Writers</h4> |
| |
| Drill provides a set of vector readers and writers. Compared to those, this |
| set: |
| <ul> |
| <li>Works with all Drill data types. The other set works only with repeated |
| and nullable types.</li> |
| <li>Is a generic interface. The other set is bound tightly to the |
| <code>ScanBatch</code> class.</li> |
| <li>Uses generic types such as <tt>getInt()</tt> for most numeric types. The |
| other set has accessors specific to each of the ~30 data types which Drill |
| supports.</li> |
| </ul> |
| The key difference is that this set is designed for both developer ease-of-use |
| and performance. Developer eas-of-use is a |
| primary requirement for unit tests. Performance is critical for production |
| code. The other set is designed to be used in |
| machine-generated or write-once code and so can be much more complex. |
| |
| <h4>Overview of the Code Structure</h4> |
| |
| <code>ScalarReader</code> and <code>ColumnWriter</code> are the core abstractions: they |
| provide simplified access to the myriad of Drill column types via a |
| simplified, uniform API. <code>TupleReader</code> and <code>TupleWriter</code> provide |
| a simplified API to rows or maps (both of which are tuples in Drill.) |
| <code>AccessorUtilities</code> provides a number of data conversion tools. |
| <dl> |
| <dt>ObjectWriter, ObjectReader</dt> |
| <dd>Drill follows a JSON data model. A row is a tuple (AKA structure). Each |
| column is a scalar, a map (AKA tuple, structure) or an array (AKA a repeated |
| value.)</dd> |
| <dt>TupleWriter, TupleReader</dt> |
| <dd>In relational terms, a tuple is an ordered collection of values, where |
| the meaning of the order is provided by a schema (usually a name/type pair.) |
| It turns out that Drill rows and maps are both tuples. The tuple classes |
| provide the means to work with a tuple: get the schema, get a column by name |
| or by position. Note that Drill code normally references columns by name. |
| But, doing so is slower than access by position (index). To provide efficient |
| code, the tuple classes assume that the implementation imposes a column |
| ordering which can be exposed via the indexes.</dd> |
| <dt>ScalarWriter, ScalarReader</dt> |
| <dd>A uniform interface for the scalar types: Nullable (Drill optional) and |
| non-nullable (Drill required) fields use the same interface. Arrays (Drill |
| repeated) are special. To handle the array aspect, even array fields use the |
| same interface, but the <tt>getArray</tt> method returns another layer of |
| accessor (writer or reader) specific for arrays. |
| <p> |
| Both the column reader and writer use a reduced set of data types to access |
| values. Drill provides about 38 different types, but they can be mapped to a |
| smaller set for programmatic access. For example, the signed byte, short, |
| int; and the unsigned 8-bit, and 16-bit values can all be mapped to ints for |
| get/set. The result is a much simpler set of get/set methods compared to the |
| underlying set of vector types.</dt> |
| <dt>ArrayWriter, ArrayReader |
| <dt> |
| <dd>The interface for the array accessors as described above. Of particular |
| note is the difference in the form of the methods. The writer has only a |
| <tt>setInt()</tt> method, no index. The methods assume write-only, write-once |
| semantics: each set adds a new value. The reader, by contrast has a |
| <tt>getInt(int index)</tt> method: read access is random.</tt> |
| <dt>ScalarWriter<dt> |
| <dd>Because of the form of the array writer, both the array writer and |
| column writer have the same method signatures. To avoid repeating these |
| methods, they are factored out into the common <tt>ScalarWriter</tt> |
| interface.</dd> |
| <dt>ColumnAccessors (templates)</dt> |
| <dd>The Freemarker-based template used to generate the actual accessor |
| implementations.</dd> |
| <dt>ColumnAccessors (accessors)</dt> |
| <dd>The generated accessors: one for each combination of write/read, data |
| (minor) type and cardinality (data model). |
| <dd> |
| <dt>ColumnReaderIndex, ColumnWriterIndex</dt> |
| <dd>This nested class binds the accessor to the current row position for the |
| entire record batch. That is, you don't ask for the value of column a for row |
| 5, then the value of column b for row 5, etc. as with the "raw" vectors. |
| Instead, the implementation sets the row position (with, say an iterator.) |
| Then, all columns implicitly return values for the current row. |
| <p> |
| Different implementations of the row index handle the case of no selection |
| vector, a selection vector 2, or a selection vector 4.</dd> |
| <dt>VectorAccessor</dt> |
| <dd>The readers can work with single batches or "hyper" |
| batches. A hyper batch occurs in operators such as sort where an operator |
| references a collection of batches as if they were one huge batch. In this |
| case, each column consists of a "stack" of vectors. The vector accessor picks |
| out one vector from the stack for each row. Vector accessors are used only |
| for hyper batches; single batches work directly with the corresponding |
| vector. |
| <p> |
| You can think of the (row index + vector accessor, column index) as forming a |
| coordinate pair. The row index provides the y index (vertical position along |
| the rows.) The vector accessor maps the row position to a vector when needed. |
| The column index picks out the x coordinate (horizontal position along the |
| columns.)</dt> |
| </dl> |
| <h4>Column Writer Optimizations</h4> |
| The writer classes here started as a simple abstraction on top of the existing |
| vector mutators. The classes were then recruited for use in a new writer |
| abstraction for Drill's record readers. At that point, performance became |
| critical. The key to performance is to bypass the vector and the mutator and |
| instead work with the Netty direct memory functions. This seems a risky |
| approach until we realize that the writers form a very clear interface: |
| the same interface supported the original mutator-based implementation and |
| the revised Netty-based implementation. The benefit, however, is stark; |
| the direct-to-Netty version is up to 4x faster (for repeated types). |
| |
| <h4>Tuple Model</h4> |
| |
| Drill has the idea of row and of a map. (A Drill map is much like a "struct": |
| every instance of the "map" must have the same columns.) Both are instances |
| of the relational concept of a "tuple." In relational theory, a tuple is |
| a collection of values in which each value has a name and a position. The |
| name is for the user, the position (index) allows efficient implementation. |
| <p> |
| Drill is unusual among query and DB engines in that it does not normally |
| use indexes. The reason is easy to understand. Suppose two files contain |
| columns a and b. File 1, read by minor fragment 0, contains the columns in |
| the order (a, b). But, file 2, read by minor fragment 1, contains the columns |
| in the order (b, a). Drill considers this the same schema. Since column |
| order can vary, Drill has avoided depending on column order. (But, only |
| partly; many bugs have cropped up because some parts of the code do |
| require common ordering.) |
| <p> |
| Here we observe that column order varies only across fragments. We have |
| control of the column order within our own fragment. (We can coerce varying |
| order into a desired order. If the above two files are read by the same |
| scan operator, then the first file sets the order at (a, b), and the second |
| files (b, a) order can be coerced into the (a, b) order. |
| <p> |
| Given this insight, the readers and writers here promote position to a |
| first-class concept. Code can access columns by name (for convenience, |
| especially in testing) or by position (for efficiency.) |
| <p> |
| Further, it is often convenient to fetch a column accessor (reader or |
| writer) once, then cache it. The design here ensures that such caching works |
| well. The goal is that, eventually, operators will code-generate references |
| to cached readers and writers instead of generating code that works directly |
| with the vectors. |
| |
| <h4>Lists and Unions</h4> |
| |
| Drill provides a List and a Union type. These types are incomplete, buggy |
| and ill-supported by Drill's operators. However, they are key to Drill's |
| JSON-powered, schema-free marketing message. Thus, we must support them |
| in the reader/writer level even if they are broken and under-used elsewhere |
| in Drill. (If we did not support them, then the JSON readers could not use |
| the new model, and we'd have to support both the old and new versions, which |
| would create a bigger mess than we started with.) |
| <p> |
| Drill's other types have a more-or-less simple mapping to the relational |
| model, allowing simple reader and writer interfaces. But, the Union and List |
| types are not a good fit and cause a very large amount of complexity in the |
| reader and writer models. |
| <p> |
| A Union is just that: it is a container for a variety of typed vectors. It |
| is like a "union" in C: it has members for each type, but only one type is |
| in use at any one time. However, unlike C, the implementation is more like |
| a C "struct" every vector takes space or every row, even if no value is stored |
| in that row. That is, a Drill union is as if a naive C programmer used a |
| "struct" when s/he should have used a union. |
| <p> |
| Unions are designed to evolve dynamically as data is read. Suppose we read |
| the following JSON:<pre></code> |
| {a: 10} {a: "foo"} {a: null} {a: 12.34} |
| </code></pre> |
| Here, we discover the need for an Int type, then a Varchar, then mark a |
| value as null and finally a Float. The union adds the desired types as we |
| request them. The writer mimics this behavior, using a listener to do the |
| needed vector work. |
| <p> |
| Further, a union can be null. It carries a types vector that indicates the |
| type of each row. A zero-value indicates that the union as a whole is null. |
| In this case, null means no value, is is not, say, a null Int or null |
| Varchar: it is simply null (as in JSON). Since at most one vector within the union |
| carries a value, the element vectors must also be nullable. This means |
| that a union has two null bits: one or the union, the other for the |
| selected type. It is not clear what Drill semantics are supposed to be. Here |
| the writers assume that either the whole union is null, or that exactly one |
| member is non-null. Readers are more paranoid: they assume each member is null |
| if either the union is null or the member itself is null. (Yes, a bit of a |
| mess...) |
| <p> |
| The current union vector format is highly inefficient. |
| If the union concept is needed, then it should |
| be redesigned, perhaps as a variable-width vector in which each entry |
| consists of a type/value pair. (For variable-width values such as |
| strings, the implementation would be a triple of (type, length, |
| value). The API here is designed to abstract away the implementation |
| and should work equally well for the current "union" implementation and |
| the possible "variant" implementation. As a result, when changing the |
| API, avoid introducing methods that assume an implementation. |
| <p> |
| Lists add another layer of complexity. A list is, logically, a repeated |
| union. But, for whatever historical reasons, a List can be other things |
| as well. First, it can have no type at all: a list of nothing. This likely |
| has no meaning, but the semantics of the List vector allow it. Second, the |
| List can be an array of a single type in which each entry can be null. |
| (Normal Repeated types can have an empty array for a row, but cannot have |
| a null entry. Lists can have either an empty array or a null array in |
| order to model the JSON <tt>null</tt> and <tt>[]</tt> cases.) |
| <p> |
| When a List has a single type, it stores the backing vector directly within |
| the List. But, a list can also be a list of unions. In this case, the List |
| stores a union vector as its backing vector. Here, we now have three ways |
| to indicate null: the List's bits vector, the type vector in the union, and |
| the bits vector in each element vector. Again, the writer assumes that |
| if the List vector is null, the entire value for that row is null. The reader |
| is again paranoid and handles all three nullable states. (Again, a huge |
| mess.) |
| <p> |
| The readers can provide a nice API for these cases since we know the List |
| format up front. They can present the list as either a nullable array of |
| a single type, or as an array of unions. |
| <p> |
| Writers have more of a challenge. If we knew that a List was being used as |
| a list of, say, Nullable Int, we could present the List as an array writer |
| with Int elements. But, the List allows dynamic type addition, as with unions. |
| (In the case of the list, it has internal special handling for the single vs. |
| many type case.) |
| <p> |
| To isolate the client from the list representation, it is simpler to always |
| present a List an array of variants. But, this is awkward in the single-type |
| case. The solution is to use metadata. If the metadata promises to use only |
| a single type, the writer can use the nullable array of X format. If the |
| metadata says to use a union (the default), then the List is presented as |
| an array of unions, even when the list has 0 or 1 member types. (The |
| complexity here is excessive: Drill should really redesign this feature to make |
| it simpler and to better fit the relational model.) |
| |
| <h4>Vector Evolution</h4> |
| |
| Drill uses value vector classes created during the rush to ship Drill 1.0. |
| They are not optimal: the key value is that the vectors work. |
| <p> |
| The Apache Arrow project created a refined version of the vector classes. |
| Much talk has occurred about ripping out Drill's implementation to use |
| Arrow instead. |
| <p> |
| However, even Arrow has limits: |
| <ul> |
| <li>Like Drill, it uses twice the number of positions in the offset vector |
| as for the values vector. (Drill allocates power-of-two sizes. The offset |
| vector has one more entry than values. With a power-of-two number of values, |
| offsets are rounded to the next power of two.)</li> |
| <li>Like Drill before this work, Arrow does not manage vector sizes; it |
| allows vectors to grow without bound, causing the memory problems that this |
| project seeks to resolve.</li> |
| <li>Like Drill, Arrow implements unions as a space-inefficient collection |
| of vectors format.</li> |
| </ul> |
| If we learn from the above, we might want to create a Value Vectors 2.0 |
| based on the following concepts: |
| <ul> |
| <li>Store vector values as a chain of fixed-size buffers. This avoids |
| memory fragmentation, makes memory allocation much more efficient, is |
| easier on the client, and avoids internal fragmentation.</li> |
| <li>Store offsets as the end value, not the start value. This eliminates |
| the extra offset position, simplifies indexing, and can save on internal |
| memory fragmentation.</li> |
| <li>Store unions using "variant encoding" as described above.</li> |
| </ul> |
| Such changes would be a huge project if every operator continued to work |
| directly with vectors and memory buffers. In fact, the cost would be so |
| high that these improvements might never be done. |
| <p> |
| Therefore, a goal of this reader/writer layer is to isolate the operators |
| from vector implementation. For this to work, the accessors must be at least |
| as efficient as direct vector access. (They are now more efficient.) |
| <p> |
| Once all operators use this layer, a switch to Arrow, or an evolution toward |
| Value Vectors 2.0 will be much easier. Simply change the vector format and |
| update the reader and writer implementations. The rest of the code will |
| remain unchanged. (Note, to achieve this goal, it is important to carefully |
| design the accessor API [interfaces] to hide implementation details.) |
| |
| <h4>Simpler Reader API</h4> |
| |
| A key value of Drill is the ability for users to add custom record readers. |
| But, at present, doing so is very complex because the developer must know |
| quite a bit about Drill internals. At this level, they must know how to |
| allocate vectors, how to write to each kind of vector, how to keep track |
| of array sizes, how to set the vector and batch row counts, and more. In |
| general, there is only one right way to do this work. (Though some readers |
| use the old-style vector writers, others work with direct memory instead |
| of with vectors, and so on.) |
| <p> |
| This layer handles all that work, providing a simple API that encourages |
| more custom readers because the work to create the readers becomes far |
| simpler. (Other layers tackle other parts of the problem as well.)</div> |
| </div> |
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