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| <h2 title="Interface InitializerContext" class="title">Interface InitializerContext</h2> |
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| <pre>public interface <span class="typeNameLabel">InitializerContext</span></pre> |
| <div class="block">Provides context for <a href="InitializerExpressionFactory.html" title="interface in org.apache.calcite.sql2rel"><code>InitializerExpressionFactory</code></a> methods.</div> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Method</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code><a href="../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#convertExpression(org.apache.calcite.sql.SqlNode)">convertExpression</a></span>​(<a href="../sql/SqlNode.html" title="class in org.apache.calcite.sql">SqlNode</a> expr)</code></th> |
| <td class="colLast"> |
| <div class="block">Converts a <code>SqlNode</code> to <code>RexNode</code>.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="../rex/RexBuilder.html" title="class in org.apache.calcite.rex">RexBuilder</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getRexBuilder()">getRexBuilder</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>default <a href="../sql/SqlNode.html" title="class in org.apache.calcite.sql">SqlNode</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#parseExpression(org.apache.calcite.sql.parser.SqlParser.Config,java.lang.String)">parseExpression</a></span>​(<a href="../sql/parser/SqlParser.Config.html" title="interface in org.apache.calcite.sql.parser">SqlParser.Config</a> config, |
| <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a> expr)</code></th> |
| <td class="colLast"> |
| <div class="block">Parse a column computation expression for a table.</div> |
| </td> |
| </tr> |
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| <td class="colFirst"><code><a href="../sql/SqlNode.html" title="class in org.apache.calcite.sql">SqlNode</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#validateExpression(org.apache.calcite.rel.type.RelDataType,org.apache.calcite.sql.SqlNode)">validateExpression</a></span>​(<a href="../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a> rowType, |
| <a href="../sql/SqlNode.html" title="class in org.apache.calcite.sql">SqlNode</a> expr)</code></th> |
| <td class="colLast"> |
| <div class="block">Validate the expression with a base table row type.</div> |
| </td> |
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| <h4>getRexBuilder</h4> |
| <pre class="methodSignature"><a href="../rex/RexBuilder.html" title="class in org.apache.calcite.rex">RexBuilder</a> getRexBuilder()</pre> |
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| <h4>parseExpression</h4> |
| <pre class="methodSignature">default <a href="../sql/SqlNode.html" title="class in org.apache.calcite.sql">SqlNode</a> parseExpression​(<a href="../sql/parser/SqlParser.Config.html" title="interface in org.apache.calcite.sql.parser">SqlParser.Config</a> config, |
| <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a> expr)</pre> |
| <div class="block">Parse a column computation expression for a table. Usually this expression is declared |
| in the create table statement, i.e. |
| <pre> |
| create table t( |
| a int not null, |
| b varchar(5) as (my_udf(a)) virtual, |
| c int not null as (a + 1) |
| ); |
| </pre> |
| |
| <p>You can use the string format expression "my_udf(a)" and "a + 1" |
| as the initializer expression of column b and c. |
| |
| <p>Calcite doesn't really need this now because the DDL nodes |
| can be executed directly from <code>SqlNode</code>s, but we still provide the way |
| to initialize from a SQL-like string, because a string can be used to persist easily and |
| the column expressions are important part of the table metadata.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>config</code> - parse config</dd> |
| <dd><code>expr</code> - the SQL-style column expression</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a <code>SqlNode</code> instance</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="validateExpression(org.apache.calcite.rel.type.RelDataType,org.apache.calcite.sql.SqlNode)"> |
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| <h4>validateExpression</h4> |
| <pre class="methodSignature"><a href="../sql/SqlNode.html" title="class in org.apache.calcite.sql">SqlNode</a> validateExpression​(<a href="../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a> rowType, |
| <a href="../sql/SqlNode.html" title="class in org.apache.calcite.sql">SqlNode</a> expr)</pre> |
| <div class="block">Validate the expression with a base table row type. The expression may reference the fields |
| of the row type defines.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>rowType</code> - the table row type</dd> |
| <dd><code>expr</code> - the expression</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a validated <code>SqlNode</code>, usually it transforms |
| from a <code>SqlUnresolvedFunction</code> to a resolved one</dd> |
| </dl> |
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| <h4>convertExpression</h4> |
| <pre class="methodSignature"><a href="../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a> convertExpression​(<a href="../sql/SqlNode.html" title="class in org.apache.calcite.sql">SqlNode</a> expr)</pre> |
| <div class="block">Converts a <code>SqlNode</code> to <code>RexNode</code>. |
| |
| <p>Caution that the <code>SqlNode</code> must be validated, |
| you can use <a href="#validateExpression(org.apache.calcite.rel.type.RelDataType,org.apache.calcite.sql.SqlNode)"><code>validateExpression(org.apache.calcite.rel.type.RelDataType, org.apache.calcite.sql.SqlNode)</code></a> to validate if the <code>SqlNode</code> |
| is un-validated.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>expr</code> - the expression of sql node to convert</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a converted <code>RexNode</code> instance</dd> |
| </dl> |
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