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| <h2 title="Class TestNullColumnLoader" class="title">Class TestNullColumnLoader</h2> |
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| <li>org.apache.drill.exec.physical.impl.scan.project.TestNullColumnLoader</li> |
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| <pre>public class <span class="typeNameLabel">TestNullColumnLoader</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 mechanism that handles all-null columns during projection. |
| An all-null column is one projected in the query, but which does |
| not actually exist in the underlying data source (or input |
| operator.) |
| <p> |
| In anticipation of having type information, this mechanism |
| can create the classic nullable Int null column, or one of |
| any other type and mode.</div> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/TestNullColumnLoader.html#TestNullColumnLoader--">TestNullColumnLoader</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/impl/scan/project/TestNullColumnLoader.html#testBasics--">testBasics</a></span>()</code> |
| <div class="block">Test the simplest case: default null type, nothing in the vector |
| cache.</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/TestNullColumnLoader.html#testCachedTypesAllowRequired--">testCachedTypesAllowRequired</a></span>()</code> |
| <div class="block">Suppose, in the previous test, that one of the columns that |
| goes missing is a required column.</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/TestNullColumnLoader.html#testCachedTypesMapToNullable--">testCachedTypesMapToNullable</a></span>()</code> |
| <div class="block">Drill requires "schema persistence": if a scan operator |
| reads two files, F1 and F2, then the scan operator must |
| provide the same vectors from both readers.</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/TestNullColumnLoader.html#testCustomNullType--">testCustomNullType</a></span>()</code> |
| <div class="block">Test the ability to use a type other than nullable INT for null |
| columns.</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/TestNullColumnLoader.html#testDefaultValue--">testDefaultValue</a></span>()</code> |
| <div class="block">Test the ability to provide a default value for a "null" column.</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/TestNullColumnLoader.html#testNullColumnBuilder--">testNullColumnBuilder</a></span>()</code> |
| <div class="block">Test the shim class that adapts between the null column loader |
| and the projection mechanism.</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/TestNullColumnLoader.html#testNullColumnBuilderWithSchema--">testNullColumnBuilderWithSchema</a></span>()</code> |
| <div class="block">Test using an output schema, along with a default value property, |
| to define a default value for missing columns.</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/TestNullColumnLoader.html#testSchemaWithConflicts--">testSchemaWithConflicts</a></span>()</code> |
| <div class="block">Test the various conflicts that can occur: |
| |
| Schema is required, but no default value for null column. |
| Query wants a different type than that in the schema. |
| Query wants a different mode than that in the schema. |
| |
| |
| The type and mode provided to the builder is that which would result from |
| schema smoothing.</div> |
| </td> |
| </tr> |
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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>TestNullColumnLoader</h4> |
| <pre>public TestNullColumnLoader()</pre> |
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| <pre>public void testBasics()</pre> |
| <div class="block">Test the simplest case: default null type, nothing in the vector |
| cache. Specify no column type, the special NULL type, or a |
| predefined type. Output types should be set accordingly.</div> |
| </li> |
| </ul> |
| <a name="testCustomNullType--"> |
| <!-- --> |
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| <h4>testCustomNullType</h4> |
| <pre>public void testCustomNullType()</pre> |
| <div class="block">Test the ability to use a type other than nullable INT for null |
| columns. This occurs, for example, in the CSV reader where no |
| column is ever INT (nullable or otherwise) and we want our null |
| columns to be (non-nullable) VARCHAR.</div> |
| </li> |
| </ul> |
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| <h4>testDefaultValue</h4> |
| <pre>public void testDefaultValue()</pre> |
| <div class="block">Test the ability to provide a default value for a "null" column. |
| Default values are only allowed for required "null" columns. For |
| nullable columns, NULL is already the default.</div> |
| </li> |
| </ul> |
| <a name="testCachedTypesMapToNullable--"> |
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| </a> |
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| <li class="blockList"> |
| <h4>testCachedTypesMapToNullable</h4> |
| <pre>public void testCachedTypesMapToNullable()</pre> |
| <div class="block">Drill requires "schema persistence": if a scan operator |
| reads two files, F1 and F2, then the scan operator must |
| provide the same vectors from both readers. Not just the |
| same types, the same value vector instances (but, of course, |
| populated with different data.) |
| <p> |
| Test the case in which the reader for F1 found columns |
| (a, b, c) but, F2 found only (a, b), requiring that we |
| fill in column c, filled with nulls, but of the same type that it |
| was in file F1. We use a vector cache to pull off this trick. |
| This test ensures that the null column mechanism looks in that |
| vector cache when asked to create a nullable column.</div> |
| </li> |
| </ul> |
| <a name="testCachedTypesAllowRequired--"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>testCachedTypesAllowRequired</h4> |
| <pre>public void testCachedTypesAllowRequired()</pre> |
| <div class="block">Suppose, in the previous test, that one of the columns that |
| goes missing is a required column. The null-column mechanism can |
| create the "null" column as a required column, then fill it with |
| empty values (zero or "") -- if the scan operator feels doing so would |
| be helpful.</div> |
| </li> |
| </ul> |
| <a name="testNullColumnBuilder--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>testNullColumnBuilder</h4> |
| <pre>public void testNullColumnBuilder()</pre> |
| <div class="block">Test the shim class that adapts between the null column loader |
| and the projection mechanism. The projection mechanism uses this |
| to pull in the null columns which the null column loader has |
| created.</div> |
| </li> |
| </ul> |
| <a name="testNullColumnBuilderWithSchema--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
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| <h4>testNullColumnBuilderWithSchema</h4> |
| <pre>public void testNullColumnBuilderWithSchema()</pre> |
| <div class="block">Test using an output schema, along with a default value property, |
| to define a default value for missing columns.</div> |
| </li> |
| </ul> |
| <a name="testSchemaWithConflicts--"> |
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| </a> |
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| <h4>testSchemaWithConflicts</h4> |
| <pre>public void testSchemaWithConflicts()</pre> |
| <div class="block">Test the various conflicts that can occur: |
| <ul> |
| <li>Schema is required, but no default value for null column.</li> |
| <li>Query wants a different type than that in the schema.</li> |
| <li>Query wants a different mode than that in the schema.</li> |
| <ul> |
| |
| The type and mode provided to the builder is that which would result from |
| schema smoothing. The types and modes should usually match, but verify |
| the rules when they don't. |
| <p> |
| Defaults for null columns are ignored: null columns use NULL as the |
| null value.</div> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
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