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| <div class="subTitle">org.apache.drill.exec.physical.impl.scan.v3.schema</div> |
| <h2 title="Class ScanSchemaResolver" class="title">Class ScanSchemaResolver</h2> |
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| <li>org.apache.drill.exec.physical.impl.scan.v3.schema.ScanSchemaResolver</li> |
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| <pre>public class <span class="typeNameLabel">ScanSchemaResolver</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">Resolves a schema against the existing scan schema. |
| Expands columns by comparing the existing scan schema with |
| a "revised" (provided or reader) schema, adjusting the scan schema |
| accordingly. Maps are expanded recursively. Other columns |
| must match types (concrete columns) or the type must match projection |
| (for dynamic columns.) |
| <ul> |
| <li>Resolves a provided schema against the projection list. |
| The provided schema can be strict (converts a wildcard into |
| an explicit projection) or lenient (the reader can add |
| additional columns to a wildcard.)</li> |
| <li>Resolves an early reader schema against the projection list |
| and optional provided schema.</li> |
| <li>Resolves a reader output schema against a dynamic (projection |
| list), concreted (provided or prior reader) schema) or combination. |
| </ul> |
| <p> |
| In practice, the logic is simpler: given a schema (dynamic, concrete |
| or combination), further resolve the schema using the input schema |
| provided. Resolve dynamic columns, verify consistency of concrete |
| columns. |
| <p> |
| Projected columns start as <i>dynamic</i> (no type). Columns |
| are resolved to a known type as a schema identifies that type. |
| Subsequent schemas are obligated to use that same type to avoid |
| an inconsistent schema change downstream. |
| <p> |
| Expands columns by comparing the existing scan schema with |
| a "revised" (provided or reader) schema, adjusting the scan schema |
| accordingly. Maps are expanded recursively. Other columns |
| must match types (concrete columns) or the type must match projection |
| (for dynamic columns.) |
| <p> |
| A "resolved" projection list is a list of concrete columns: table |
| columns, nulls, file metadata or partition metadata. An unresolved list |
| has either table column names, but no match, or a wildcard column. |
| <p> |
| The idea is that the projection list moves through stages of resolution |
| depending on which information is available. An "early schema" table |
| provides schema information up front, and so allows fully resolving |
| the projection list on table open. A "late schema" table allows only a |
| partially resolved projection list, with the remainder of resolution |
| happening on the first (or perhaps every) batch.</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/scan/v3/schema/ScanSchemaResolver.SchemaType.html" title="enum in org.apache.drill.exec.physical.impl.scan.v3.schema">ScanSchemaResolver.SchemaType</a></span></code> |
| <div class="block">Indicates the source of the schema to be analyzed.</div> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/schema/ScanSchemaResolver.html#ScanSchemaResolver-org.apache.drill.exec.physical.impl.scan.v3.schema.MutableTupleSchema-org.apache.drill.exec.physical.impl.scan.v3.schema.ScanSchemaResolver.SchemaType-boolean-org.apache.drill.common.exceptions.CustomErrorContext-">ScanSchemaResolver</a></span>(<a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/schema/MutableTupleSchema.html" title="class in org.apache.drill.exec.physical.impl.scan.v3.schema">MutableTupleSchema</a> schema, |
| <a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/schema/ScanSchemaResolver.SchemaType.html" title="enum in org.apache.drill.exec.physical.impl.scan.v3.schema">ScanSchemaResolver.SchemaType</a> mode, |
| boolean allowMapAdditions, |
| <a href="../../../../../../../../../org/apache/drill/common/exceptions/CustomErrorContext.html" title="interface in org.apache.drill.common.exceptions">CustomErrorContext</a> errorContext)</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/v3/schema/ScanSchemaResolver.html#applySchema-org.apache.drill.exec.record.metadata.TupleMetadata-">applySchema</a></span>(<a href="../../../../../../../../../org/apache/drill/exec/record/metadata/TupleMetadata.html" title="interface in org.apache.drill.exec.record.metadata">TupleMetadata</a> sourceSchema)</code> </td> |
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| <a name="ScanSchemaResolver-org.apache.drill.exec.physical.impl.scan.v3.schema.MutableTupleSchema-org.apache.drill.exec.physical.impl.scan.v3.schema.ScanSchemaResolver.SchemaType-boolean-org.apache.drill.common.exceptions.CustomErrorContext-"> |
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| <h4>ScanSchemaResolver</h4> |
| <pre>public ScanSchemaResolver(<a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/schema/MutableTupleSchema.html" title="class in org.apache.drill.exec.physical.impl.scan.v3.schema">MutableTupleSchema</a> schema, |
| <a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/schema/ScanSchemaResolver.SchemaType.html" title="enum in org.apache.drill.exec.physical.impl.scan.v3.schema">ScanSchemaResolver.SchemaType</a> mode, |
| boolean allowMapAdditions, |
| <a href="../../../../../../../../../org/apache/drill/common/exceptions/CustomErrorContext.html" title="interface in org.apache.drill.common.exceptions">CustomErrorContext</a> errorContext)</pre> |
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| <h4>applySchema</h4> |
| <pre>public void applySchema(<a href="../../../../../../../../../org/apache/drill/exec/record/metadata/TupleMetadata.html" title="interface in org.apache.drill.exec.record.metadata">TupleMetadata</a> sourceSchema)</pre> |
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