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| <div class="subTitle">org.apache.drill.exec.physical.impl.scan.project</div> |
| <h2 title="Class TestSchemaSmoothing" class="title">Class TestSchemaSmoothing</h2> |
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| <li>org.apache.drill.exec.physical.impl.scan.project.TestSchemaSmoothing</li> |
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| <pre>public class <span class="typeNameLabel">TestSchemaSmoothing</span> |
| extends <a href="../../../../../../../../org/apache/drill/test/SubOperatorTest.html" title="class in org.apache.drill.test">SubOperatorTest</a></pre> |
| <div class="block">Tests schema smoothing at the schema projection level. |
| This level handles reusing prior types when filling null |
| values. But, because no actual vectors are involved, it |
| does not handle the schema chosen for a table ahead of |
| time, only the schema as it is merged with prior schema to |
| detect missing columns. |
| <p> |
| Focuses on the <tt>SmoothingProjection</tt> class itself. |
| <p> |
| Note that, at present, schema smoothing does not work for entire |
| maps. That is, if file 1 has, say <tt>{a: {b: 10, c: "foo"}}</tt> |
| and file 2 has, say, <tt>{a: null}</tt>, then schema smoothing does |
| not currently know how to recreate the map. The same is true of |
| lists and unions. Handling such cases is complex and is probably |
| better handled via a system that allows the user to specify their |
| intent by providing a schema to apply to the two files. |
| <p> |
| Note that schema smoothing itself is an experimental work-around |
| to a fundamental limitation in Drill: |
| <ul> |
| <li>Drill cannot predict the future: each file (or batch) |
| may have a different schema.</li> |
| <li>Drill does not know about these differences until they |
| occur.</li> |
| <li>The scan operator is obligated to return the same schema |
| (and same vectors) from one file to the next, else a "hard" |
| schema change is sent down stream.</li> |
| </ul> |
| |
| The problem is actually intractable. The schema smoother handles the |
| cases that can be handled, such as required --> nullable, a column |
| disappearing, etc. This whole mechanism should be scrapped if/when |
| Drill can work with schemas. Or, keep this to handle, as best we can, |
| odd schemas, but insist on a schema to resolve issues that this |
| mechanism cannot handle (and that, indeed, no algorithm could handle |
| because such an algorithm would require time-travel: looking into |
| the future to know what data will be scanned.)</div> |
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| <th class="colOne" scope="col">Constructor and Description</th> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/TestSchemaSmoothing.html#TestSchemaSmoothing--">TestSchemaSmoothing</a></span>()</code> </td> |
| </tr> |
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| <tr id="i0" 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/project/TestSchemaSmoothing.html#testDifferentCase--">testDifferentCase</a></span>()</code> |
| <div class="block">The prior and table schemas are identical, but the cases of names differ.</div> |
| </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/physical/impl/scan/project/TestSchemaSmoothing.html#testDifferentTypes--">testDifferentTypes</a></span>()</code> |
| <div class="block">Column names match, but types differ.</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/project/TestSchemaSmoothing.html#testDiscrete--">testDiscrete</a></span>()</code> |
| <div class="block">Sanity test for the simple, discrete case.</div> |
| </td> |
| </tr> |
| <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/project/TestSchemaSmoothing.html#testDisjoint--">testDisjoint</a></span>()</code> |
| <div class="block">Case in which the table schema and prior are disjoint |
| sets.</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/project/TestSchemaSmoothing.html#testLongerPartitionLength--">testLongerPartitionLength</a></span>()</code> |
| <div class="block">If using the legacy wildcard expansion, we are able to use the same |
| schema even if the new partition path is longer than the previous.</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/project/TestSchemaSmoothing.html#testMissingNullableColumns--">testMissingNullableColumns</a></span>()</code> |
| <div class="block">Preserve the prior schema if table is a subset and missing columns |
| are nullable or repeated.</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/project/TestSchemaSmoothing.html#testReordering--">testReordering</a></span>()</code> |
| <div class="block">Preserve the prior schema if table is a subset.</div> |
| </td> |
| </tr> |
| <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/project/TestSchemaSmoothing.html#testRequired--">testRequired</a></span>()</code> |
| <div class="block">Can't preserve the prior schema if it had required columns |
| where the new schema has no columns.</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/project/TestSchemaSmoothing.html#testSamePartitionLength--">testSamePartitionLength</a></span>()</code> |
| <div class="block">If using the legacy wildcard expansion, reuse schema if partition paths |
| are the same length.</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/project/TestSchemaSmoothing.html#testSameSchemas--">testSameSchemas</a></span>()</code> |
| <div class="block">The prior and table schemas are identical.</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/project/TestSchemaSmoothing.html#testShorterPartitionLength--">testShorterPartitionLength</a></span>()</code> |
| <div class="block">If using the legacy wildcard expansion, reuse schema if the new partition path |
| is shorter than the previous.</div> |
| </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/project/TestSchemaSmoothing.html#testSmaller--">testSmaller</a></span>()</code> |
| <div class="block">Case in which the table schema is a superset of the prior |
| schema.</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/project/TestSchemaSmoothing.html#testSmoothableSchemaBatches--">testSmoothableSchemaBatches</a></span>()</code> |
| <div class="block">Integrated test across multiple schemas at the batch level.</div> |
| </td> |
| </tr> |
| <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/physical/impl/scan/project/TestSchemaSmoothing.html#testSmoothingProjection--">testSmoothingProjection</a></span>()</code> |
| <div class="block">Low-level test of the smoothing projection, including the exceptions |
| it throws when things are not going its way.</div> |
| </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/physical/impl/scan/project/TestSchemaSmoothing.html#testWildcardSmoothing--">testWildcardSmoothing</a></span>()</code> |
| <div class="block">A SELECT * query uses the schema of the table as the output schema.</div> |
| </td> |
| </tr> |
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| <h4>TestSchemaSmoothing</h4> |
| <pre>public TestSchemaSmoothing()</pre> |
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| <pre>public void testDiscrete()</pre> |
| <div class="block">Sanity test for the simple, discrete case. The purpose of |
| discrete is just to run the basic lifecycle in a way that |
| is compatible with the schema-persistence version.</div> |
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| <pre>public void testSmoothingProjection()</pre> |
| <div class="block">Low-level test of the smoothing projection, including the exceptions |
| it throws when things are not going its way.</div> |
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| <h4>testSmaller</h4> |
| <pre>public void testSmaller()</pre> |
| <div class="block">Case in which the table schema is a superset of the prior |
| schema. Discard prior schema. Turn off auto expansion of |
| metadata for a simpler test.</div> |
| </li> |
| </ul> |
| <a name="testDisjoint--"> |
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| </a> |
| <ul class="blockList"> |
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| <h4>testDisjoint</h4> |
| <pre>public void testDisjoint()</pre> |
| <div class="block">Case in which the table schema and prior are disjoint |
| sets. Discard the prior schema.</div> |
| </li> |
| </ul> |
| <a name="testDifferentTypes--"> |
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| </a> |
| <ul class="blockList"> |
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| <h4>testDifferentTypes</h4> |
| <pre>public void testDifferentTypes()</pre> |
| <div class="block">Column names match, but types differ. Discard the prior schema.</div> |
| </li> |
| </ul> |
| <a name="testSameSchemas--"> |
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| </a> |
| <ul class="blockList"> |
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| <h4>testSameSchemas</h4> |
| <pre>public void testSameSchemas()</pre> |
| <div class="block">The prior and table schemas are identical. Preserve the prior |
| schema (though, the output is no different than if we discarded |
| the prior schema...)</div> |
| </li> |
| </ul> |
| <a name="testDifferentCase--"> |
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| </a> |
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| <h4>testDifferentCase</h4> |
| <pre>public void testDifferentCase()</pre> |
| <div class="block">The prior and table schemas are identical, but the cases of names differ. |
| Preserve the case of the first schema.</div> |
| </li> |
| </ul> |
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| <h4>testRequired</h4> |
| <pre>public void testRequired()</pre> |
| <div class="block">Can't preserve the prior schema if it had required columns |
| where the new schema has no columns.</div> |
| </li> |
| </ul> |
| <a name="testMissingNullableColumns--"> |
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| </a> |
| <ul class="blockList"> |
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| <h4>testMissingNullableColumns</h4> |
| <pre>public void testMissingNullableColumns()</pre> |
| <div class="block">Preserve the prior schema if table is a subset and missing columns |
| are nullable or repeated.</div> |
| </li> |
| </ul> |
| <a name="testReordering--"> |
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| <h4>testReordering</h4> |
| <pre>public void testReordering()</pre> |
| <div class="block">Preserve the prior schema if table is a subset. Map the table |
| columns to the output using the prior schema ordering.</div> |
| </li> |
| </ul> |
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| <h4>testSamePartitionLength</h4> |
| <pre>public void testSamePartitionLength()</pre> |
| <div class="block">If using the legacy wildcard expansion, reuse schema if partition paths |
| are the same length.</div> |
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| </ul> |
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| <h4>testShorterPartitionLength</h4> |
| <pre>public void testShorterPartitionLength()</pre> |
| <div class="block">If using the legacy wildcard expansion, reuse schema if the new partition path |
| is shorter than the previous. (Unneeded partitions will be set to null by the |
| scan projector.)</div> |
| </li> |
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| <a name="testLongerPartitionLength--"> |
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| <h4>testLongerPartitionLength</h4> |
| <pre>public void testLongerPartitionLength()</pre> |
| <div class="block">If using the legacy wildcard expansion, we are able to use the same |
| schema even if the new partition path is longer than the previous. |
| Because all file names are provided up front.</div> |
| </li> |
| </ul> |
| <a name="testSmoothableSchemaBatches--"> |
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| <h4>testSmoothableSchemaBatches</h4> |
| <pre>public void testSmoothableSchemaBatches()</pre> |
| <div class="block">Integrated test across multiple schemas at the batch level.</div> |
| </li> |
| </ul> |
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| </a> |
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| <li class="blockList"> |
| <h4>testWildcardSmoothing</h4> |
| <pre>public void testWildcardSmoothing()</pre> |
| <div class="block">A SELECT * query uses the schema of the table as the output schema. |
| This is trivial when the scanner has one table. But, if two or more |
| tables occur, then things get interesting. The first table sets the |
| schema. The second table then has: |
| <ul> |
| <li>The same schema, trivial case.</li> |
| <li>A subset of the first table. The type of the "missing" column |
| from the first table is used for a null column in the second table.</li> |
| <li>A superset or disjoint set of the first schema. This triggers a hard schema |
| change.</li> |
| </ul> |
| <p> |
| It is an open question whether previous columns should be preserved on |
| a hard reset. For now, the code implements, and this test verifies, that a |
| hard reset clears the "memory" of prior schemas.</div> |
| </li> |
| </ul> |
| </li> |
| </ul> |
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