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| <h2 title="Class TestResultSetLoaderUnions" class="title">Class TestResultSetLoaderUnions</h2> |
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| <pre>public class <span class="typeNameLabel">TestResultSetLoaderUnions</span> |
| extends <a href="../../../../../../../org/apache/drill/test/SubOperatorTest.html" title="class in org.apache.drill.test">SubOperatorTest</a></pre> |
| <div class="block">Tests the result set loader support for union vectors. Union vectors |
| are only lightly supported in Apache Drill and not supported at all |
| in commercial versions. They have may problems: both in code and in theory. |
| Most operators do not support them. But, JSON uses them, so they must |
| be made to work in the result set loader layer.</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/resultSet/impl/TestResultSetLoaderUnions.html#TestResultSetLoaderUnions--">TestResultSetLoaderUnions</a></span>()</code> </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/resultSet/impl/TestResultSetLoaderUnions.html#testListofListofScalar--">testListofListofScalar</a></span>()</code> |
| <div class="block">The semantics of the ListVector are such that it allows |
| multi-dimensional lists.</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/resultSet/impl/TestResultSetLoaderUnions.html#testRepeatedListOfUnion--">testRepeatedListOfUnion</a></span>()</code> |
| <div class="block">The repeated list type is way off in the weeds in Drill.</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/resultSet/impl/TestResultSetLoaderUnions.html#testSimpleList--">testSimpleList</a></span>()</code> |
| <div class="block">Test for the case of a list defined to contain exactly one type.</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/resultSet/impl/TestResultSetLoaderUnions.html#testSimpleListDynamic--">testSimpleListDynamic</a></span>()</code> |
| <div class="block">Test a simple list created dynamically at load time.</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/resultSet/impl/TestResultSetLoaderUnions.html#testSimpleListMultiTypes--">testSimpleListMultiTypes</a></span>()</code> |
| <div class="block">Try to create a simple (non-expandable) list while specifying |
| two types.</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/resultSet/impl/TestResultSetLoaderUnions.html#testSimpleListNoTypes--">testSimpleListNoTypes</a></span>()</code> |
| <div class="block">Try to create a simple (non-expandable) list without |
| giving a member type.</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/resultSet/impl/TestResultSetLoaderUnions.html#testUnionAddTypes--">testUnionAddTypes</a></span>()</code> </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/resultSet/impl/TestResultSetLoaderUnions.html#testUnionBasics--">testUnionBasics</a></span>()</code> </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/resultSet/impl/TestResultSetLoaderUnions.html#testUnionOverflow--">testUnionOverflow</a></span>()</code> </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/resultSet/impl/TestResultSetLoaderUnions.html#testVariantListDynamic--">testVariantListDynamic</a></span>()</code> |
| <div class="block">Test a variant list created dynamically at load time.</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/resultSet/impl/TestResultSetLoaderUnions.html#testVariantListWithMap--">testVariantListWithMap</a></span>()</code> |
| <div class="block">Dynamically add a map to a list that also contains scalars.</div> |
| </td> |
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| <h3>Methods inherited from class org.apache.drill.test.<a href="../../../../../../../org/apache/drill/test/SubOperatorTest.html" title="class in org.apache.drill.test">SubOperatorTest</a></h3> |
| <code><a href="../../../../../../../org/apache/drill/test/SubOperatorTest.html#classSetup--">classSetup</a>, <a href="../../../../../../../org/apache/drill/test/SubOperatorTest.html#classTeardown--">classTeardown</a></code></li> |
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| <h4>TestResultSetLoaderUnions</h4> |
| <pre>public TestResultSetLoaderUnions()</pre> |
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| <pre>public void testUnionBasics()</pre> |
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| <pre>public void testUnionAddTypes()</pre> |
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| <pre>public void testUnionOverflow()</pre> |
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| <h4>testSimpleList</h4> |
| <pre>public void testSimpleList()</pre> |
| <div class="block">Test for the case of a list defined to contain exactly one type. |
| Relies on the row set tests to verify that the single type model |
| works for lists. Here we test that the ResultSetLoader put the |
| pieces together correctly.</div> |
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| <h4>testSimpleListDynamic</h4> |
| <pre>public void testSimpleListDynamic()</pre> |
| <div class="block">Test a simple list created dynamically at load time. |
| The list must include a single type member.</div> |
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| <h4>testSimpleListNoTypes</h4> |
| <pre>public void testSimpleListNoTypes()</pre> |
| <div class="block">Try to create a simple (non-expandable) list without |
| giving a member type. Expected to fail.</div> |
| </li> |
| </ul> |
| <a name="testSimpleListMultiTypes--"> |
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| </a> |
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| <h4>testSimpleListMultiTypes</h4> |
| <pre>public void testSimpleListMultiTypes()</pre> |
| <div class="block">Try to create a simple (non-expandable) list while specifying |
| two types. Expected to fail.</div> |
| </li> |
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| <h4>testVariantListDynamic</h4> |
| <pre>public void testVariantListDynamic()</pre> |
| <div class="block">Test a variant list created dynamically at load time. |
| The list starts with no type, at which time it can hold |
| only null values. Then we add a Varchar, and finally an |
| Int. |
| <p> |
| This test is superficial. There are many odd cases to consider. |
| <ul> |
| <li>Write nulls to a list with no type. (This test ensures that |
| adding a (nullable) scalar "does the right thing."</li> |
| <li>Add a map to the list. Maps carry no "bits" vector, so null |
| list entries to that point are lost. (For maps, we could go straight |
| to a union, with just a map, to preserve the null states. This whole |
| area is a huge mess...)</li> |
| <li>Do the type transitions when writing to a row. (The tests here |
| do the transition between rows.)</li> |
| </ul> |
| |
| The reason for the sparse coverage is that Drill barely supports lists |
| and unions; most code is just plain broken. Our goal here is not to fix |
| all those problems, just to leave things no more broken than before.</div> |
| </li> |
| </ul> |
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| </a> |
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| <h4>testVariantListWithMap</h4> |
| <pre>public void testVariantListWithMap()</pre> |
| <div class="block">Dynamically add a map to a list that also contains scalars. |
| Assumes that <a href="../../../../../../../org/apache/drill/exec/physical/resultSet/impl/TestResultSetLoaderUnions.html#testVariantListDynamic--"><code>testVariantListDynamic()</code></a> passed.</div> |
| </li> |
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| <h4>testListofListofScalar</h4> |
| <pre>public void testListofListofScalar()</pre> |
| <div class="block">The semantics of the ListVector are such that it allows |
| multi-dimensional lists. In this way, it is like a (slightly |
| more normalized) version of the repeated list vector. This form |
| allows arrays to be null. |
| <p> |
| This test verifies that the (non-repeated) list vector can |
| be used to create multi-dimensional arrays in the result set |
| loader layer. However, the rest of Drill does not support this |
| functionality at present, so this test is more of a proof-of- |
| concept than a necessity.</div> |
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| <a name="testRepeatedListOfUnion--"> |
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| <h4>testRepeatedListOfUnion</h4> |
| <pre>public void testRepeatedListOfUnion()</pre> |
| <div class="block">The repeated list type is way off in the weeds in Drill. It is not fully |
| supported and the semantics are very murky as a result. It is not clear |
| how such a structure fits into SQL or into an xDBC client. Still, it is |
| part of Drill at present and must be supported in the result set loader. |
| <p> |
| This test models using the repeated list as a 2D array of UNION.</div> |
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