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| <div class="subTitle">org.apache.drill.exec.store.parquet.columnreaders</div> |
| <h2 title="Class ParquetSchema" class="title">Class ParquetSchema</h2> |
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| <li>org.apache.drill.exec.store.parquet.columnreaders.ParquetSchema</li> |
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| <pre>public final class <span class="typeNameLabel">ParquetSchema</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre> |
| <div class="block">Mapping from the schema of the Parquet file to that of the record reader |
| to the schema that Drill and the Parquet reader uses.</div> |
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| <th class="colOne" scope="col">Constructor and Description</th> |
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| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ParquetSchema.html#ParquetSchema-org.apache.drill.exec.server.options.OptionManager-int-org.apache.parquet.hadoop.metadata.ParquetMetadata-java.util.Collection-">ParquetSchema</a></span>(<a href="../../../../../../../org/apache/drill/exec/server/options/OptionManager.html" title="interface in org.apache.drill.exec.server.options">OptionManager</a> options, |
| int rowGroupIndex, |
| org.apache.parquet.hadoop.metadata.ParquetMetadata footer, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><<a href="../../../../../../../org/apache/drill/common/expression/SchemaPath.html" title="class in org.apache.drill.common.expression">SchemaPath</a>> selectedCols)</code> |
| <div class="block">Build the Parquet schema.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
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| <th class="colLast" scope="col">Method and Description</th> |
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| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ParquetSchema.html#allFieldsFixedLength--">allFieldsFixedLength</a></span>()</code> </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ParquetSchema.html#buildSchema--">buildSchema</a></span>()</code> |
| <div class="block">Build the schema for this read as a combination of the schema specified in |
| the Parquet footer and the list of columns selected in the query.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ParquetSchema.html#createNonExistentColumns-org.apache.drill.exec.physical.impl.OutputMutator-java.util.List-">createNonExistentColumns</a></span>(<a href="../../../../../../../org/apache/drill/exec/physical/impl/OutputMutator.html" title="interface in org.apache.drill.exec.physical.impl">OutputMutator</a> output, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../../../../org/apache/drill/exec/vector/NullableIntVector.html" title="class in org.apache.drill.exec.vector">NullableIntVector</a>> nullFilledVectors)</code> |
| <div class="block">Create "dummy" fields for columns which are selected in the SELECT clause, but not |
| present in the Parquet schema.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>org.apache.parquet.hadoop.metadata.ParquetMetadata</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ParquetSchema.html#footer--">footer</a></span>()</code> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ParquetSchema.html#getBitWidthAllFixedFields--">getBitWidthAllFixedFields</a></span>()</code> </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ParquetColumnMetadata.html" title="class in org.apache.drill.exec.store.parquet.columnreaders">ParquetColumnMetadata</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ParquetSchema.html#getColumnMetadata--">getColumnMetadata</a></span>()</code> </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ParquetSchema.html#getGroupRecordCount--">getGroupRecordCount</a></span>()</code> |
| <div class="block">Return the Parquet file row count.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>org.apache.parquet.hadoop.metadata.BlockMetaData</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ParquetSchema.html#getRowGroupMetadata--">getRowGroupMetadata</a></span>()</code> </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ParquetSchema.html#isStarQuery--">isStarQuery</a></span>()</code> </td> |
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| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
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| <h3>Constructor Detail</h3> |
| <a name="ParquetSchema-org.apache.drill.exec.server.options.OptionManager-int-org.apache.parquet.hadoop.metadata.ParquetMetadata-java.util.Collection-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
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| <h4>ParquetSchema</h4> |
| <pre>public ParquetSchema(<a href="../../../../../../../org/apache/drill/exec/server/options/OptionManager.html" title="interface in org.apache.drill.exec.server.options">OptionManager</a> options, |
| int rowGroupIndex, |
| org.apache.parquet.hadoop.metadata.ParquetMetadata footer, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><<a href="../../../../../../../org/apache/drill/common/expression/SchemaPath.html" title="class in org.apache.drill.common.expression">SchemaPath</a>> selectedCols)</pre> |
| <div class="block">Build the Parquet schema. The schema can be based on a "SELECT *", |
| meaning we want all columns defined in the Parquet file. In this case, |
| the list of selected columns is null. Or, the query can be based on |
| an explicit list of selected columns. In this case, the |
| columns need not exist in the Parquet file. If a column does not exist, |
| the reader returns null for that column. If no selected column exists |
| in the file, then we return "mock" records: records with only null |
| values, but repeated for the number of rows in the Parquet file.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>options</code> - session options</dd> |
| <dd><code>rowGroupIndex</code> - row group to read</dd> |
| <dd><code>selectedCols</code> - columns specified in the SELECT clause, or null if |
| this is a SELECT * query</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
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| <!-- ============ METHOD DETAIL ========== --> |
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| <a name="buildSchema--"> |
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| <li class="blockList"> |
| <h4>buildSchema</h4> |
| <pre>public void buildSchema()</pre> |
| <div class="block">Build the schema for this read as a combination of the schema specified in |
| the Parquet footer and the list of columns selected in the query.</div> |
| </li> |
| </ul> |
| <a name="isStarQuery--"> |
| <!-- --> |
| </a> |
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| <h4>isStarQuery</h4> |
| <pre>public boolean isStarQuery()</pre> |
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| <h4>footer</h4> |
| <pre>public org.apache.parquet.hadoop.metadata.ParquetMetadata footer()</pre> |
| </li> |
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| <h4>getBitWidthAllFixedFields</h4> |
| <pre>public int getBitWidthAllFixedFields()</pre> |
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| <li class="blockList"> |
| <h4>allFieldsFixedLength</h4> |
| <pre>public boolean allFieldsFixedLength()</pre> |
| </li> |
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| <a name="getColumnMetadata--"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getColumnMetadata</h4> |
| <pre>public <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ParquetColumnMetadata.html" title="class in org.apache.drill.exec.store.parquet.columnreaders">ParquetColumnMetadata</a>> getColumnMetadata()</pre> |
| </li> |
| </ul> |
| <a name="getGroupRecordCount--"> |
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| </a> |
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| <h4>getGroupRecordCount</h4> |
| <pre>public long getGroupRecordCount()</pre> |
| <div class="block">Return the Parquet file row count.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>number of records in the Parquet row group</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getRowGroupMetadata--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getRowGroupMetadata</h4> |
| <pre>public org.apache.parquet.hadoop.metadata.BlockMetaData getRowGroupMetadata()</pre> |
| </li> |
| </ul> |
| <a name="createNonExistentColumns-org.apache.drill.exec.physical.impl.OutputMutator-java.util.List-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>createNonExistentColumns</h4> |
| <pre>public void createNonExistentColumns(<a href="../../../../../../../org/apache/drill/exec/physical/impl/OutputMutator.html" title="interface in org.apache.drill.exec.physical.impl">OutputMutator</a> output, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../../../../org/apache/drill/exec/vector/NullableIntVector.html" title="class in org.apache.drill.exec.vector">NullableIntVector</a>> nullFilledVectors) |
| throws <a href="../../../../../../../org/apache/drill/exec/exception/SchemaChangeException.html" title="class in org.apache.drill.exec.exception">SchemaChangeException</a></pre> |
| <div class="block">Create "dummy" fields for columns which are selected in the SELECT clause, but not |
| present in the Parquet schema.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>output</code> - the output container</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/drill/exec/exception/SchemaChangeException.html" title="class in org.apache.drill.exec.exception">SchemaChangeException</a></code> - should not occur</dd> |
| </dl> |
| </li> |
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