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| <div class="subTitle">org.apache.calcite.schema</div> |
| <h2 title="接口 TableFactory" class="title">接口 TableFactory<T extends <a href="../../../../org/apache/calcite/schema/Table.html" title="org.apache.calcite.schema中的接口">Table</a>></h2> |
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| <dt><span class="paramLabel">类型参数:</span></dt> |
| <dd><code>T</code> - Sub-type of table created by this factory</dd> |
| </dl> |
| <dl> |
| <dt>所有已知实现类:</dt> |
| <dd><a href="../../../../org/apache/calcite/adapter/csv/CsvStreamTableFactory.html" title="org.apache.calcite.adapter.csv中的类">CsvStreamTableFactory</a>, <a href="../../../../org/apache/calcite/adapter/csv/CsvTableFactory.html" title="org.apache.calcite.adapter.csv中的类">CsvTableFactory</a>, <a href="../../../../org/apache/calcite/adapter/druid/DruidTableFactory.html" title="org.apache.calcite.adapter.druid中的类">DruidTableFactory</a>, <a href="../../../../org/apache/calcite/adapter/kafka/KafkaTableFactory.html" title="org.apache.calcite.adapter.kafka中的类">KafkaTableFactory</a>, <a href="../../../../org/apache/calcite/adapter/pig/PigTableFactory.html" title="org.apache.calcite.adapter.pig中的类">PigTableFactory</a>, <a href="../../../../org/apache/calcite/chinook/PreferredAlbumsTableFactory.html" title="org.apache.calcite.chinook中的类">PreferredAlbumsTableFactory</a>, <a href="../../../../org/apache/calcite/chinook/PreferredGenresTableFactory.html" title="org.apache.calcite.chinook中的类">PreferredGenresTableFactory</a>, <a href="../../../../org/apache/calcite/adapter/redis/RedisTableFactory.html" title="org.apache.calcite.adapter.redis中的类">RedisTableFactory</a></dd> |
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| <pre>public interface <span class="typeNameLabel">TableFactory<T extends <a href="../../../../org/apache/calcite/schema/Table.html" title="org.apache.calcite.schema中的接口">Table</a>></span></pre> |
| <div class="block">Factory for <a href="../../../../org/apache/calcite/schema/Table.html" title="org.apache.calcite.schema中的接口"><code>Table</code></a> objects. |
| |
| <p>A table factory allows you to include custom tables in a model file. |
| For example, here is a model that contains a custom table that generates |
| a range of integers.</p> |
| |
| <blockquote><pre>{ |
| version: '1.0', |
| defaultSchema: 'MATH', |
| schemas: [ |
| { |
| name: 'MATH', |
| tables: [ |
| { |
| name: 'INTEGERS', |
| type: 'custom', |
| factory: 'com.acme.IntegerTable', |
| operand: { |
| start: 3, |
| end: 7, |
| column: 'N' |
| } |
| } |
| ] |
| } |
| ] |
| }</pre></blockquote> |
| |
| <p>Given that schema, the query</p> |
| |
| <blockquote><pre>SELECT * FROM math.integers</pre></blockquote> |
| |
| <p>returns</p> |
| |
| <blockquote><pre> |
| +---+ |
| | N | |
| +---+ |
| | 3 | |
| | 4 | |
| | 5 | |
| | 6 | |
| +---+ |
| </pre></blockquote> |
| |
| <p>A class that implements TableFactory specified in a schema must have a |
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| <td class="colFirst"><code><a href="../../../../org/apache/calcite/schema/TableFactory.html" title="TableFactory中的类型参数">T</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/schema/TableFactory.html#create-org.apache.calcite.schema.SchemaPlus-java.lang.String-java.util.Map-org.apache.calcite.rel.type.RelDataType-">create</a></span>(<a href="../../../../org/apache/calcite/schema/SchemaPlus.html" title="org.apache.calcite.schema中的接口">SchemaPlus</a> schema, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a> name, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="java.util中的类或接口">Map</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="java.lang中的类或接口">Object</a>> operand, |
| <a href="../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> rowType)</code> |
| <div class="block">Creates a Table.</div> |
| </td> |
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| <h4>create</h4> |
| <pre><a href="../../../../org/apache/calcite/schema/TableFactory.html" title="TableFactory中的类型参数">T</a> create(<a href="../../../../org/apache/calcite/schema/SchemaPlus.html" title="org.apache.calcite.schema中的接口">SchemaPlus</a> schema, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a> name, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="java.util中的类或接口">Map</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="java.lang中的类或接口">Object</a>> operand, |
| <a href="../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> rowType)</pre> |
| <div class="block">Creates a Table.</div> |
| <dl> |
| <dt><span class="paramLabel">参数:</span></dt> |
| <dd><code>schema</code> - Schema this table belongs to</dd> |
| <dd><code>name</code> - Name of this table</dd> |
| <dd><code>operand</code> - The "operand" JSON property</dd> |
| <dd><code>rowType</code> - Row type. Specified if the "columns" JSON property.</dd> |
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