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| <div class="subTitle">org.apache.drill.exec.physical.impl.validate</div> |
| <h2 title="Class BatchValidator" class="title">Class BatchValidator</h2> |
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| <ul class="inheritance"> |
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| <li>org.apache.drill.exec.physical.impl.validate.BatchValidator</li> |
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| <pre>public class <span class="typeNameLabel">BatchValidator</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">Validate a batch of value vectors. It is not possible to validate the |
| data, but we can validate the structure, especially offset vectors. |
| Only handles single (non-hyper) vectors at present. Current form is |
| self-contained. Better checks can be done by moving checks inside |
| vectors or by exposing more metadata from vectors. |
| <p> |
| Drill is not clear on how to handle a batch of zero records. Offset |
| vectors normally have one more entry than the record count. If a |
| batch has 1 record, the offset vector has 2 entries. The entry at |
| 0 is always 0, the entry at 1 marks the end of the 0th record. |
| <p> |
| But, this gets a bit murky. If a batch has one record, and contains |
| a repeated map, and the map has no entries, then the nested offset |
| vector usually has 0 entries, not 1. |
| <p> |
| Generalizing, sometimes when a batch has zero records, the "top-level" |
| offset vectors have 1 items, sometimes zero items. |
| <p> |
| The simplest solution would be to simply enforce here that all offset |
| vectors must have n+1 entries, where n is the row count (top-level |
| vectors) or item count (nested vectors.) |
| <p> |
| But, after fighting with the code, this seems an unobtainable goal. |
| For one thing, deserialization seems to rely on nested offset vectors |
| having zero entries when the value count is zero. |
| <p> |
| Instead, this code assumes that any offset vector, top-level or |
| nested, will have zero entries if the value count is zero. That is |
| an offset vector has either zero entries or n+1 entries.</div> |
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| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/validate/BatchValidator.BaseErrorReporter.html" title="class in org.apache.drill.exec.physical.impl.validate">BatchValidator.BaseErrorReporter</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static interface </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/validate/BatchValidator.ErrorReporter.html" title="interface in org.apache.drill.exec.physical.impl.validate">BatchValidator.ErrorReporter</a></span></code> </td> |
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| <td class="colFirst"><code>static boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/validate/BatchValidator.html#LOG_TO_STDOUT">LOG_TO_STDOUT</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/validate/BatchValidator.html#MAX_ERRORS">MAX_ERRORS</a></span></code> </td> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/validate/BatchValidator.html#BatchValidator-org.apache.drill.exec.physical.impl.validate.BatchValidator.ErrorReporter-">BatchValidator</a></span>(<a href="../../../../../../../org/apache/drill/exec/physical/impl/validate/BatchValidator.ErrorReporter.html" title="interface in org.apache.drill.exec.physical.impl.validate">BatchValidator.ErrorReporter</a> errorReporter)</code> </td> |
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| <td class="colFirst"><code>static boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/validate/BatchValidator.html#validate-org.apache.drill.exec.record.RecordBatch-">validate</a></span>(<a href="../../../../../../../org/apache/drill/exec/record/RecordBatch.html" title="interface in org.apache.drill.exec.record">RecordBatch</a> batch)</code> </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/validate/BatchValidator.html#validate-org.apache.drill.exec.record.VectorAccessible-">validate</a></span>(<a href="../../../../../../../org/apache/drill/exec/record/VectorAccessible.html" title="interface in org.apache.drill.exec.record">VectorAccessible</a> batch)</code> </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/validate/BatchValidator.html#validateBatch-org.apache.drill.exec.record.VectorAccessible-int-">validateBatch</a></span>(<a href="../../../../../../../org/apache/drill/exec/record/VectorAccessible.html" title="interface in org.apache.drill.exec.record">VectorAccessible</a> batch, |
| int rowCount)</code> </td> |
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| <h4>LOG_TO_STDOUT</h4> |
| <pre>public static final boolean LOG_TO_STDOUT</pre> |
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| <dd><a href="../../../../../../../constant-values.html#org.apache.drill.exec.physical.impl.validate.BatchValidator.LOG_TO_STDOUT">Constant Field Values</a></dd> |
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| <pre>public static final int MAX_ERRORS</pre> |
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| <dd><a href="../../../../../../../constant-values.html#org.apache.drill.exec.physical.impl.validate.BatchValidator.MAX_ERRORS">Constant Field Values</a></dd> |
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| <h4>BatchValidator</h4> |
| <pre>public BatchValidator(<a href="../../../../../../../org/apache/drill/exec/physical/impl/validate/BatchValidator.ErrorReporter.html" title="interface in org.apache.drill.exec.physical.impl.validate">BatchValidator.ErrorReporter</a> errorReporter)</pre> |
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| <h4>validate</h4> |
| <pre>public static boolean validate(<a href="../../../../../../../org/apache/drill/exec/record/RecordBatch.html" title="interface in org.apache.drill.exec.record">RecordBatch</a> batch)</pre> |
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| <pre>public static boolean validate(<a href="../../../../../../../org/apache/drill/exec/record/VectorAccessible.html" title="interface in org.apache.drill.exec.record">VectorAccessible</a> batch)</pre> |
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| <pre>public void validateBatch(<a href="../../../../../../../org/apache/drill/exec/record/VectorAccessible.html" title="interface in org.apache.drill.exec.record">VectorAccessible</a> batch, |
| int rowCount)</pre> |
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