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<div class="subTitle">org.apache.drill.exec.physical.impl.scan</div>
<h2 title="Class TestScanOrchestratorEarlySchema" class="title">Class TestScanOrchestratorEarlySchema</h2>
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<pre>public class <span class="typeNameLabel">TestScanOrchestratorEarlySchema</span>
extends <a href="../../../../../../../org/apache/drill/test/SubOperatorTest.html" title="class in org.apache.drill.test">SubOperatorTest</a></pre>
<div class="block">Test the early-schema support of the scan orchestrator. "Early schema"
refers to the case in which the reader can provide a schema when the
reader is opened. Examples: CSV, HBase, MapR-DB binary, JDBC.
<p>
The tests here focus on the scan orchestrator itself; the tests assume
that tests for lower-level components have already passed.</div>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/scan/TestScanOrchestratorEarlySchema.html#TestScanOrchestratorEarlySchema--">TestScanOrchestratorEarlySchema</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/physical/impl/scan/TestScanOrchestratorEarlySchema.html#testColumnReordering--">testColumnReordering</a></span>()</code>
<div class="block">Verify that different table column orders are projected into the
SELECT order, preserving vectors, so no schema change for column
reordering.</div>
</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/physical/impl/scan/TestScanOrchestratorEarlySchema.html#testEarlySchemaSelectAll--">testEarlySchemaSelectAll</a></span>()</code>
<div class="block">Test SELECT a, b FROM table(a, b)</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/physical/impl/scan/TestScanOrchestratorEarlySchema.html#testEarlySchemaSelectAllReorder--">testEarlySchemaSelectAllReorder</a></span>()</code>
<div class="block">Test SELECT b, a FROM table(a, b)</div>
</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/scan/TestScanOrchestratorEarlySchema.html#testEarlySchemaSelectExtra--">testEarlySchemaSelectExtra</a></span>()</code>
<div class="block">Test SELECT a, b, c FROM table(a, b)
c will be null</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/scan/TestScanOrchestratorEarlySchema.html#testEarlySchemaSelectExtraCustomType--">testEarlySchemaSelectExtraCustomType</a></span>()</code>
<div class="block">Test SELECT a, b, c FROM table(a, b)
c will be null of type VARCHAR</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/scan/TestScanOrchestratorEarlySchema.html#testEarlySchemaSelectNone--">testEarlySchemaSelectNone</a></span>()</code>
<div class="block">Test SELECT - FROM table(a, b)</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/scan/TestScanOrchestratorEarlySchema.html#testEarlySchemaSelectSubset--">testEarlySchemaSelectSubset</a></span>()</code>
<div class="block">Test SELECT a FROM table(a, b)</div>
</td>
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<tr id="i7" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/scan/TestScanOrchestratorEarlySchema.html#testEarlySchemaWildcard--">testEarlySchemaWildcard</a></span>()</code>
<div class="block">Test SELECT * from an early-schema table of (a, b)</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/scan/TestScanOrchestratorEarlySchema.html#testEmptySchema--">testEmptySchema</a></span>()</code>
<div class="block">Test SELECT * from an early-schema table of () (that is,
a schema that consists of zero columns.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/scan/TestScanOrchestratorEarlySchema.html#testEmptySchemaExtra--">testEmptySchemaExtra</a></span>()</code>
<div class="block">Test SELECT a from an early-schema table of () (that is,
a schema that consists of zero columns.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/scan/TestScanOrchestratorEarlySchema.html#testModeSmoothing--">testModeSmoothing</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/scan/TestScanOrchestratorEarlySchema.html#testTypeSmoothing--">testTypeSmoothing</a></span>()</code>
<div class="block">Test the ability of the scan scanner to "smooth" out schema changes
by reusing the type from a previous reader, if known.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/scan/TestScanOrchestratorEarlySchema.html#testTypeSmoothingExplicit--">testTypeSmoothingExplicit</a></span>()</code>
<div class="block">The projection mechanism provides "type smoothing": null
columns prefer the type of previously-seen non-null columns.</div>
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<h4>TestScanOrchestratorEarlySchema</h4>
<pre>public&nbsp;TestScanOrchestratorEarlySchema()</pre>
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<pre>public&nbsp;void&nbsp;testEarlySchemaWildcard()</pre>
<div class="block">Test SELECT * from an early-schema table of (a, b)</div>
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<pre>public&nbsp;void&nbsp;testEarlySchemaSelectAll()</pre>
<div class="block">Test SELECT a, b FROM table(a, b)</div>
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<pre>public&nbsp;void&nbsp;testEarlySchemaSelectAllReorder()</pre>
<div class="block">Test SELECT b, a FROM table(a, b)</div>
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<pre>public&nbsp;void&nbsp;testEarlySchemaSelectExtra()</pre>
<div class="block">Test SELECT a, b, c FROM table(a, b)
c will be null</div>
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<pre>public&nbsp;void&nbsp;testEarlySchemaSelectExtraCustomType()</pre>
<div class="block">Test SELECT a, b, c FROM table(a, b)
c will be null of type VARCHAR</div>
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<pre>public&nbsp;void&nbsp;testEarlySchemaSelectSubset()</pre>
<div class="block">Test SELECT a FROM table(a, b)</div>
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<pre>public&nbsp;void&nbsp;testEarlySchemaSelectNone()</pre>
<div class="block">Test SELECT - FROM table(a, b)</div>
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<pre>public&nbsp;void&nbsp;testEmptySchema()</pre>
<div class="block">Test SELECT * from an early-schema table of () (that is,
a schema that consists of zero columns.</div>
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<pre>public&nbsp;void&nbsp;testEmptySchemaExtra()</pre>
<div class="block">Test SELECT a from an early-schema table of () (that is,
a schema that consists of zero columns.</div>
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<pre>public&nbsp;void&nbsp;testTypeSmoothingExplicit()</pre>
<div class="block">The projection mechanism provides "type smoothing": null
columns prefer the type of previously-seen non-null columns.
<code><pre>
SELECT a, b ...
Table 1: (a: BIGINT, b: VARCHAR)
Table 2: (a: BIGINT)
Table 3: (b: VARCHAR)
</pre></code>
The result in all cases should be
<tt>(a : BIGINT, b: VARCHAR)</tt></div>
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<pre>public&nbsp;void&nbsp;testTypeSmoothing()</pre>
<div class="block">Test the ability of the scan scanner to "smooth" out schema changes
by reusing the type from a previous reader, if known. That is,
given three readers:<br>
(a, b)<br>
(b)<br>
(a, b)<br>
Then the type of column a should be preserved for the second reader that
does not include a. This works if a is nullable. If so, a's type will
be used for the empty column, rather than the usual nullable int.
<p>
Detailed testing of type matching for "missing" columns is done
in <code>#testNullColumnLoader()</code>.
<p>
As a side effect, makes sure that two identical tables (in this case,
separated by a different table) results in no schema change.</div>
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<h4>testModeSmoothing</h4>
<pre>public&nbsp;void&nbsp;testModeSmoothing()</pre>
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<pre>public&nbsp;void&nbsp;testColumnReordering()</pre>
<div class="block">Verify that different table column orders are projected into the
SELECT order, preserving vectors, so no schema change for column
reordering.</div>
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