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<div class="subTitle">org.apache.drill.exec.store.parquet.columnreaders</div>
<h2 title="Class ReadState" class="title">Class ReadState</h2>
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<pre>public class <span class="typeNameLabel">ReadState</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">Internal state for reading from a Parquet file. Tracks information
required from one call of <tt>next()</tt> to the next.
<p>
At present, this is a bit of a muddle as it holds all read state.
As such, this is a snapshot of a refactoring effort. Subsequent passes
will move state into specific readers where possible.</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/ReadState.html#ReadState-org.apache.drill.exec.store.parquet.columnreaders.ParquetSchema-org.apache.drill.exec.store.parquet.columnreaders.batchsizing.RecordBatchSizerManager-org.apache.drill.exec.store.parquet.ParquetReaderStats-long-boolean-">ReadState</a></span>(<a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ParquetSchema.html" title="class in org.apache.drill.exec.store.parquet.columnreaders">ParquetSchema</a>&nbsp;schema,
<a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/batchsizing/RecordBatchSizerManager.html" title="class in org.apache.drill.exec.store.parquet.columnreaders.batchsizing">RecordBatchSizerManager</a>&nbsp;batchSizerMgr,
<a href="../../../../../../../org/apache/drill/exec/store/parquet/ParquetReaderStats.html" title="class in org.apache.drill.exec.store.parquet">ParquetReaderStats</a>&nbsp;parquetReaderStats,
long&nbsp;numRecordsToRead,
boolean&nbsp;useAsyncColReader)</code>&nbsp;</td>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<tr id="i0" class="altColor">
<td class="colFirst"><code><a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/batchsizing/RecordBatchSizerManager.html" title="class in org.apache.drill.exec.store.parquet.columnreaders.batchsizing">RecordBatchSizerManager</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ReadState.html#batchSizerMgr--">batchSizerMgr</a></span>()</code>&nbsp;</td>
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<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/ReadState.html#buildReader-org.apache.drill.exec.store.parquet.columnreaders.ParquetRecordReader-org.apache.drill.exec.physical.impl.OutputMutator-">buildReader</a></span>(<a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ParquetRecordReader.html" title="class in org.apache.drill.exec.store.parquet.columnreaders">ParquetRecordReader</a>&nbsp;reader,
<a href="../../../../../../../org/apache/drill/exec/physical/impl/OutputMutator.html" title="interface in org.apache.drill.exec.physical.impl">OutputMutator</a>&nbsp;output)</code>
<div class="block">Create the readers needed to read columns: fixed-length or variable length.</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/ReadState.html#close--">close</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ReadState.html#fillNullVectors-int-">fillNullVectors</a></span>(int&nbsp;readCount)</code>
<div class="block">When the SELECT clause references columns that do not exist in the Parquet
file, we don't issue an error; instead we simply make up a column and
fill it with nulls.</div>
</td>
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<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ColumnReader.html" title="class in org.apache.drill.exec.store.parquet.columnreaders">ColumnReader</a>&lt;?&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ReadState.html#getFirstColumnReader--">getFirstColumnReader</a></span>()</code>
<div class="block">Several readers use the first column reader to get information about the whole
record or group (such as row count.)</div>
</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>&lt;<a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ColumnReader.html" title="class in org.apache.drill.exec.store.parquet.columnreaders">ColumnReader</a>&lt;?&gt;&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ReadState.html#getFixedLenColumnReaders--">getFixedLenColumnReaders</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ReadState.html#getRemainingValuesToRead--">getRemainingValuesToRead</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ReadState.html#getTotalRecordsToRead--">getTotalRecordsToRead</a></span>()</code>&nbsp;</td>
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<tr id="i8" 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/ReadState.html#getValuesReadInCurrentPass--">getValuesReadInCurrentPass</a></span>()</code>&nbsp;</td>
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<tr id="i9" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../../org/apache/drill/exec/store/parquet/ParquetReaderStats.html" title="class in org.apache.drill.exec.store.parquet">ParquetReaderStats</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ReadState.html#parquetReaderStats--">parquetReaderStats</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ReadState.html#recordsRead--">recordsRead</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ReadState.html#resetBatch--">resetBatch</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code><a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ParquetSchema.html" title="class in org.apache.drill.exec.store.parquet.columnreaders">ParquetSchema</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ReadState.html#schema--">schema</a></span>()</code>&nbsp;</td>
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<tr id="i13" 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/ReadState.html#setValuesReadInCurrentPass-int-">setValuesReadInCurrentPass</a></span>(int&nbsp;valuesReadInCurrentBatch)</code>&nbsp;</td>
</tr>
<tr id="i14" 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/ReadState.html#updateCounts-int-">updateCounts</a></span>(int&nbsp;readCount)</code>&nbsp;</td>
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<tr id="i15" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ReadState.html#useAsyncColReader--">useAsyncColReader</a></span>()</code>&nbsp;</td>
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<tr id="i16" class="altColor">
<td class="colFirst"><code><a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/VarLenBinaryReader.html" title="class in org.apache.drill.exec.store.parquet.columnreaders">VarLenBinaryReader</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ReadState.html#varLengthReader--">varLengthReader</a></span>()</code>&nbsp;</td>
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<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li>
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<h3>Constructor Detail</h3>
<a name="ReadState-org.apache.drill.exec.store.parquet.columnreaders.ParquetSchema-org.apache.drill.exec.store.parquet.columnreaders.batchsizing.RecordBatchSizerManager-org.apache.drill.exec.store.parquet.ParquetReaderStats-long-boolean-">
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<h4>ReadState</h4>
<pre>public&nbsp;ReadState(<a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ParquetSchema.html" title="class in org.apache.drill.exec.store.parquet.columnreaders">ParquetSchema</a>&nbsp;schema,
<a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/batchsizing/RecordBatchSizerManager.html" title="class in org.apache.drill.exec.store.parquet.columnreaders.batchsizing">RecordBatchSizerManager</a>&nbsp;batchSizerMgr,
<a href="../../../../../../../org/apache/drill/exec/store/parquet/ParquetReaderStats.html" title="class in org.apache.drill.exec.store.parquet">ParquetReaderStats</a>&nbsp;parquetReaderStats,
long&nbsp;numRecordsToRead,
boolean&nbsp;useAsyncColReader)</pre>
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<h4>buildReader</h4>
<pre>public&nbsp;void&nbsp;buildReader(<a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ParquetRecordReader.html" title="class in org.apache.drill.exec.store.parquet.columnreaders">ParquetRecordReader</a>&nbsp;reader,
<a href="../../../../../../../org/apache/drill/exec/physical/impl/OutputMutator.html" title="interface in org.apache.drill.exec.physical.impl">OutputMutator</a>&nbsp;output)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></pre>
<div class="block">Create the readers needed to read columns: fixed-length or variable length.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>reader</code> - parquet record reader</dd>
<dd><code>output</code> - output mutator</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code></dd>
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<pre>public&nbsp;<a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ColumnReader.html" title="class in org.apache.drill.exec.store.parquet.columnreaders">ColumnReader</a>&lt;?&gt;&nbsp;getFirstColumnReader()</pre>
<div class="block">Several readers use the first column reader to get information about the whole
record or group (such as row count.)</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the reader for the first column</dd>
</dl>
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<pre>public&nbsp;void&nbsp;resetBatch()</pre>
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<h4>schema</h4>
<pre>public&nbsp;<a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ParquetSchema.html" title="class in org.apache.drill.exec.store.parquet.columnreaders">ParquetSchema</a>&nbsp;schema()</pre>
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<pre>public&nbsp;<a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/batchsizing/RecordBatchSizerManager.html" title="class in org.apache.drill.exec.store.parquet.columnreaders.batchsizing">RecordBatchSizerManager</a>&nbsp;batchSizerMgr()</pre>
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<pre>public&nbsp;<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>&lt;<a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/ColumnReader.html" title="class in org.apache.drill.exec.store.parquet.columnreaders">ColumnReader</a>&lt;?&gt;&gt;&nbsp;getFixedLenColumnReaders()</pre>
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<pre>public&nbsp;long&nbsp;recordsRead()</pre>
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<pre>public&nbsp;<a href="../../../../../../../org/apache/drill/exec/store/parquet/columnreaders/VarLenBinaryReader.html" title="class in org.apache.drill.exec.store.parquet.columnreaders">VarLenBinaryReader</a>&nbsp;varLengthReader()</pre>
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<pre>public&nbsp;long&nbsp;getTotalRecordsToRead()</pre>
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<pre>public&nbsp;boolean&nbsp;useAsyncColReader()</pre>
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<pre>public&nbsp;<a href="../../../../../../../org/apache/drill/exec/store/parquet/ParquetReaderStats.html" title="class in org.apache.drill.exec.store.parquet">ParquetReaderStats</a>&nbsp;parquetReaderStats()</pre>
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<pre>public&nbsp;int&nbsp;getValuesReadInCurrentPass()</pre>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>values read within the latest batch</dd>
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<h4>getRemainingValuesToRead</h4>
<pre>public&nbsp;int&nbsp;getRemainingValuesToRead()</pre>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>remaining values to read</dd>
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<pre>public&nbsp;void&nbsp;setValuesReadInCurrentPass(int&nbsp;valuesReadInCurrentBatch)</pre>
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<dd><code>valuesReadInCurrentBatch</code> - the valuesReadInCurrentBatch to set</dd>
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<pre>public&nbsp;void&nbsp;fillNullVectors(int&nbsp;readCount)</pre>
<div class="block">When the SELECT clause references columns that do not exist in the Parquet
file, we don't issue an error; instead we simply make up a column and
fill it with nulls. This method does the work of null-filling the made-up
vectors.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>readCount</code> - the number of rows read in the present record batch,
which is the number of null column values to create</dd>
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<pre>public&nbsp;void&nbsp;updateCounts(int&nbsp;readCount)</pre>
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<pre>public&nbsp;void&nbsp;close()</pre>
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