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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.calcite.sql.fun</a></div> |
| <h2 title="Class SqlCaseOperator" class="title">Class SqlCaseOperator</h2> |
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| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
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| <li><a href="../SqlOperator.html" title="class in org.apache.calcite.sql">org.apache.calcite.sql.SqlOperator</a></li> |
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| <pre>public class <span class="typeNameLabel">SqlCaseOperator</span> |
| extends <a href="../SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a></pre> |
| <div class="block">An operator describing a <code>CASE</code>, <code>NULLIF</code> or <code> |
| COALESCE</code> expression. All of these forms are normalized at parse time |
| to a to a simple <code>CASE</code> statement like this: |
| |
| <blockquote><pre><code>CASE |
| WHEN <when expression_0> THEN <then expression_0> |
| WHEN <when expression_1> THEN <then expression_1> |
| ... |
| WHEN <when expression_N> THEN <then expression_N> |
| ELSE <else expression> |
| END</code></pre></blockquote> |
| |
| <p>The switched form of the <code>CASE</code> statement is normalized to the |
| simple form by inserting calls to the <code>=</code> operator. For |
| example,</p> |
| |
| <blockquote><pre><code>CASE x + y |
| WHEN 1 THEN 'fee' |
| WHEN 2 THEN 'fie' |
| ELSE 'foe' |
| END</code></pre></blockquote> |
| |
| <p>becomes</p> |
| |
| <blockquote><pre><code>CASE |
| WHEN Equals(x + y, 1) THEN 'fee' |
| WHEN Equals(x + y, 2) THEN 'fie' |
| ELSE 'foe' |
| END</code></pre></blockquote> |
| |
| <p>REVIEW jhyde 2004/3/19 Does <code>Equals</code> handle NULL semantics |
| correctly?</p> |
| |
| <p><code>COALESCE(x, y, z)</code> becomes</p> |
| |
| <blockquote><pre><code>CASE |
| WHEN x IS NOT NULL THEN x |
| WHEN y IS NOT NULL THEN y |
| ELSE z |
| END</code></pre></blockquote> |
| |
| <p><code>NULLIF(x, -1)</code> becomes</p> |
| |
| <blockquote><pre><code>CASE |
| WHEN x = -1 THEN NULL |
| ELSE x |
| END</code></pre></blockquote> |
| |
| <p>Note that some of these normalizations cause expressions to be duplicated. |
| This may make it more difficult to write optimizer rules (because the rules |
| will have to deduce that expressions are equivalent). It also requires that |
| some part of the planning process (probably the generator of the calculator |
| program) does common sub-expression elimination.</p> |
| |
| <p>REVIEW jhyde 2004/3/19. Expanding expressions at parse time has some other |
| drawbacks. It is more difficult to give meaningful validation errors: given |
| <code>COALESCE(DATE '2004-03-18', 3.5)</code>, do we issue a type-checking |
| error against a <code>CASE</code> operator? Second, I'd like to use the |
| <a href="../SqlNode.html" title="class in org.apache.calcite.sql"><code>SqlNode</code></a> object model to generate SQL to send to 3rd-party databases, |
| but there's now no way to represent a call to COALESCE or NULLIF. All in all, |
| it would be better to have operators for COALESCE, NULLIF, and both simple |
| and switched forms of CASE, then translate to simple CASE when building the |
| <a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex"><code>RexNode</code></a> tree.</p> |
| |
| <p>The arguments are physically represented as follows:</p> |
| |
| <ul> |
| <li>The <i>when</i> expressions are stored in a <a href="../SqlNodeList.html" title="class in org.apache.calcite.sql"><code>SqlNodeList</code></a> |
| whenList.</li> |
| <li>The <i>then</i> expressions are stored in a <a href="../SqlNodeList.html" title="class in org.apache.calcite.sql"><code>SqlNodeList</code></a> |
| thenList.</li> |
| <li>The <i>else</i> expression is stored as a regular <a href="../SqlNode.html" title="class in org.apache.calcite.sql"><code>SqlNode</code></a>.</li> |
| </ul></div> |
| </li> |
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| <td class="colFirst"><code>private static <a href="../SqlWriter.FrameType.html" title="interface in org.apache.calcite.sql">SqlWriter.FrameType</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#FRAME_TYPE">FRAME_TYPE</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static <a href="SqlCaseOperator.html" title="class in org.apache.calcite.sql.fun">SqlCaseOperator</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#INSTANCE">INSTANCE</a></span></code></th> |
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| <h3>Fields inherited from class org.apache.calcite.sql.<a href="../SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a></h3> |
| <code><a href="../SqlOperator.html#kind">kind</a>, <a href="../SqlOperator.html#MDX_PRECEDENCE">MDX_PRECEDENCE</a>, <a href="../SqlOperator.html#NL">NL</a></code></li> |
| </ul> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier</th> |
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| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private </code></td> |
| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E()">SqlCaseOperator</a></span>()</code></th> |
| <td class="colLast"> </td> |
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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>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#checkOperandTypes(org.apache.calcite.sql.SqlCallBinding,boolean)">checkOperandTypes</a></span>​(<a href="../SqlCallBinding.html" title="class in org.apache.calcite.sql">SqlCallBinding</a> callBinding, |
| boolean throwOnFailure)</code></th> |
| <td class="colLast"> |
| <div class="block">Checks that the operand values in a <a href="../SqlCall.html" title="class in org.apache.calcite.sql"><code>SqlCall</code></a> to this operator are |
| valid.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="../SqlCall.html" title="class in org.apache.calcite.sql">SqlCall</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#createCall(org.apache.calcite.sql.SqlLiteral,org.apache.calcite.sql.parser.SqlParserPos,org.apache.calcite.sql.SqlNode...)">createCall</a></span>​(<a href="../SqlLiteral.html" title="class in org.apache.calcite.sql">SqlLiteral</a> functionQualifier, |
| <a href="../parser/SqlParserPos.html" title="class in org.apache.calcite.sql.parser">SqlParserPos</a> pos, |
| <a href="../SqlNode.html" title="class in org.apache.calcite.sql">SqlNode</a>... operands)</code></th> |
| <td class="colLast"> |
| <div class="block">Creates a call to this operand with an array of operands.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code><a href="../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#deriveType(org.apache.calcite.sql.validate.SqlValidator,org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.SqlCall)">deriveType</a></span>​(<a href="../validate/SqlValidator.html" title="interface in org.apache.calcite.sql.validate">SqlValidator</a> validator, |
| <a href="../validate/SqlValidatorScope.html" title="interface in org.apache.calcite.sql.validate">SqlValidatorScope</a> scope, |
| <a href="../SqlCall.html" title="class in org.apache.calcite.sql">SqlCall</a> call)</code></th> |
| <td class="colLast"> |
| <div class="block">Derives the type of a call to this operator.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code><a href="../SqlOperandCountRange.html" title="interface in org.apache.calcite.sql">SqlOperandCountRange</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getOperandCountRange()">getOperandCountRange</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Returns a constraint on the number of operands expected by this operator.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code><a href="../SqlSyntax.html" title="enum in org.apache.calcite.sql">SqlSyntax</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getSyntax()">getSyntax</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Returns the syntactic type of this operator, never null.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code><a href="../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#inferReturnType(org.apache.calcite.sql.SqlOperatorBinding)">inferReturnType</a></span>​(<a href="../SqlOperatorBinding.html" title="class in org.apache.calcite.sql">SqlOperatorBinding</a> opBinding)</code></th> |
| <td class="colLast"> |
| <div class="block">Infers the return type of an invocation of this operator; only called |
| after the number and types of operands have already been validated.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>private <a href="../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#inferTypeFromOperands(org.apache.calcite.rel.type.RelDataTypeFactory,java.util.List)">inferTypeFromOperands</a></span>​(<a href="../../rel/type/RelDataTypeFactory.html" title="interface in org.apache.calcite.rel.type">RelDataTypeFactory</a> typeFactory, |
| java.util.List<<a href="../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>> argTypes)</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>private <a href="../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#inferTypeFromValidator(org.apache.calcite.sql.SqlCallBinding)">inferTypeFromValidator</a></span>​(<a href="../SqlCallBinding.html" title="class in org.apache.calcite.sql">SqlCallBinding</a> callBinding)</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#unparse(org.apache.calcite.sql.SqlWriter,org.apache.calcite.sql.SqlCall,int,int)">unparse</a></span>​(<a href="../SqlWriter.html" title="interface in org.apache.calcite.sql">SqlWriter</a> writer, |
| <a href="../SqlCall.html" title="class in org.apache.calcite.sql">SqlCall</a> call_, |
| int leftPrec, |
| int rightPrec)</code></th> |
| <td class="colLast"> |
| <div class="block">Writes a SQL representation of a call to this operator to a writer, |
| including parentheses if the operators on either side are of greater |
| precedence.</div> |
| </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#validateCall(org.apache.calcite.sql.SqlCall,org.apache.calcite.sql.validate.SqlValidator,org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.validate.SqlValidatorScope)">validateCall</a></span>​(<a href="../SqlCall.html" title="class in org.apache.calcite.sql">SqlCall</a> call, |
| <a href="../validate/SqlValidator.html" title="interface in org.apache.calcite.sql.validate">SqlValidator</a> validator, |
| <a href="../validate/SqlValidatorScope.html" title="interface in org.apache.calcite.sql.validate">SqlValidatorScope</a> scope, |
| <a href="../validate/SqlValidatorScope.html" title="interface in org.apache.calcite.sql.validate">SqlValidatorScope</a> operandScope)</code></th> |
| <td class="colLast"> |
| <div class="block">Validates a call to this operator.</div> |
| </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
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| </a> |
| <h3>Methods inherited from class org.apache.calcite.sql.<a href="../SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a></h3> |
| <code><a href="../SqlOperator.html#acceptCall(org.apache.calcite.sql.util.SqlVisitor,org.apache.calcite.sql.SqlCall)">acceptCall</a>, <a href="../SqlOperator.html#acceptCall(org.apache.calcite.sql.util.SqlVisitor,org.apache.calcite.sql.SqlCall,boolean,org.apache.calcite.sql.util.SqlBasicVisitor.ArgHandler)">acceptCall</a>, <a href="../SqlOperator.html#adjustType(org.apache.calcite.sql.validate.SqlValidator,org.apache.calcite.sql.SqlCall,org.apache.calcite.rel.type.RelDataType)">adjustType</a>, <a href="../SqlOperator.html#allowsFraming()">allowsFraming</a>, <a href="../SqlOperator.html#argumentMustBeScalar(int)">argumentMustBeScalar</a>, <a href="../SqlOperator.html#checkOperandCount(org.apache.calcite.sql.validate.SqlValidator,org.apache.calcite.sql.type.SqlOperandTypeChecker,org.apache.calcite.sql.SqlCall)">checkOperandCount</a>, <a href="../SqlOperator.html#constructArgNameList(org.apache.calcite.sql.SqlCall)">constructArgNameList</a>, <a href="../SqlOperator.html#constructArgTypeList(org.apache.calcite.sql.validate.SqlValidator,org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.SqlCall,java.util.List,boolean)">constructArgTypeList</a>, <a href="../SqlOperator.html#constructOperandList(org.apache.calcite.sql.validate.SqlValidator,org.apache.calcite.sql.SqlCall,java.util.List)">constructOperandList</a>, <a href="../SqlOperator.html#createCall(org.apache.calcite.sql.parser.SqlParserPos,java.util.List)">createCall</a>, <a href="../SqlOperator.html#createCall(org.apache.calcite.sql.parser.SqlParserPos,org.apache.calcite.sql.SqlNode...)">createCall</a>, <a href="../SqlOperator.html#createCall(org.apache.calcite.sql.SqlNodeList)">createCall</a>, <a href="../SqlOperator.html#equals(java.lang.Object)">equals</a>, <a href="../SqlOperator.html#getAllowedSignatures()">getAllowedSignatures</a>, <a href="../SqlOperator.html#getAllowedSignatures(java.lang.String)">getAllowedSignatures</a>, <a href="../SqlOperator.html#getKind()">getKind</a>, <a href="../SqlOperator.html#getLeftPrec()">getLeftPrec</a>, <a href="../SqlOperator.html#getMonotonicity(org.apache.calcite.sql.SqlCall,org.apache.calcite.sql.validate.SqlValidatorScope)">getMonotonicity</a>, <a href="../SqlOperator.html#getMonotonicity(org.apache.calcite.sql.SqlOperatorBinding)">getMonotonicity</a>, <a href="../SqlOperator.html#getName()">getName</a>, <a href="../SqlOperator.html#getNameAsId()">getNameAsId</a>, <a href="../SqlOperator.html#getOperandTypeChecker()">getOperandTypeChecker</a>, <a href="../SqlOperator.html#getOperandTypeInference()">getOperandTypeInference</a>, <a href="../SqlOperator.html#getReturnTypeInference()">getReturnTypeInference</a>, <a href="../SqlOperator.html#getRightPrec()">getRightPrec</a>, <a href="../SqlOperator.html#getSignatureTemplate(int)">getSignatureTemplate</a>, <a href="../SqlOperator.html#hashCode()">hashCode</a>, <a href="../SqlOperator.html#inferReturnType(org.apache.calcite.rel.type.RelDataTypeFactory,java.util.List)">inferReturnType</a>, <a href="../SqlOperator.html#isAggregator()">isAggregator</a>, <a href="../SqlOperator.html#isDeterministic()">isDeterministic</a>, <a href="../SqlOperator.html#isDynamicFunction()">isDynamicFunction</a>, <a href="../SqlOperator.html#isGroup()">isGroup</a>, <a href="../SqlOperator.html#isGroupAuxiliary()">isGroupAuxiliary</a>, <a href="../SqlOperator.html#isName(java.lang.String,boolean)">isName</a>, <a href="../SqlOperator.html#leftPrec(int,boolean)">leftPrec</a>, <a href="../SqlOperator.html#preValidateCall(org.apache.calcite.sql.validate.SqlValidator,org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.SqlCall)">preValidateCall</a>, <a href="../SqlOperator.html#requiresDecimalExpansion()">requiresDecimalExpansion</a>, <a href="../SqlOperator.html#requiresOrder()">requiresOrder</a>, <a href="../SqlOperator.html#requiresOver()">requiresOver</a>, <a href="../SqlOperator.html#rewriteCall(org.apache.calcite.sql.validate.SqlValidator,org.apache.calcite.sql.SqlCall)">rewriteCall</a>, <a href="../SqlOperator.html#rightPrec(int,boolean)">rightPrec</a>, <a href="../SqlOperator.html#toString()">toString</a>, <a href="../SqlOperator.html#unparseListClause(org.apache.calcite.sql.SqlWriter,org.apache.calcite.sql.SqlNode)">unparseListClause</a>, <a href="../SqlOperator.html#unparseListClause(org.apache.calcite.sql.SqlWriter,org.apache.calcite.sql.SqlNode,org.apache.calcite.sql.SqlKind)">unparseListClause</a>, <a href="../SqlOperator.html#validateOperands(org.apache.calcite.sql.validate.SqlValidator,org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.SqlCall)">validateOperands</a>, <a href="../SqlOperator.html#validRexOperands(int,org.apache.calcite.util.Litmus)">validRexOperands</a></code></li> |
| </ul> |
| <ul class="blockList"> |
| <li class="blockList"><a id="methods.inherited.from.class.java.lang.Object"> |
| <!-- --> |
| </a> |
| <h3>Methods inherited from class java.lang.Object</h3> |
| <code>clone, finalize, getClass, notify, notifyAll, wait, wait, wait</code></li> |
| </ul> |
| </li> |
| </ul> |
| </section> |
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| <div class="details"> |
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| <!-- ============ FIELD DETAIL =========== --> |
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| <h3>Field Detail</h3> |
| <a id="INSTANCE"> |
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| <h4>INSTANCE</h4> |
| <pre>public static final <a href="SqlCaseOperator.html" title="class in org.apache.calcite.sql.fun">SqlCaseOperator</a> INSTANCE</pre> |
| </li> |
| </ul> |
| <a id="FRAME_TYPE"> |
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| <li class="blockList"> |
| <h4>FRAME_TYPE</h4> |
| <pre>private static final <a href="../SqlWriter.FrameType.html" title="interface in org.apache.calcite.sql">SqlWriter.FrameType</a> FRAME_TYPE</pre> |
| </li> |
| </ul> |
| </li> |
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| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
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| <h3>Constructor Detail</h3> |
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| <h4>SqlCaseOperator</h4> |
| <pre>private SqlCaseOperator()</pre> |
| </li> |
| </ul> |
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| </ul> |
| </section> |
| <!-- ============ METHOD DETAIL ========== --> |
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| <li class="blockList"><a id="method.detail"> |
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| </a> |
| <h3>Method Detail</h3> |
| <a id="validateCall(org.apache.calcite.sql.SqlCall,org.apache.calcite.sql.validate.SqlValidator,org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.validate.SqlValidatorScope)"> |
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| <h4>validateCall</h4> |
| <pre class="methodSignature">public void validateCall​(<a href="../SqlCall.html" title="class in org.apache.calcite.sql">SqlCall</a> call, |
| <a href="../validate/SqlValidator.html" title="interface in org.apache.calcite.sql.validate">SqlValidator</a> validator, |
| <a href="../validate/SqlValidatorScope.html" title="interface in org.apache.calcite.sql.validate">SqlValidatorScope</a> scope, |
| <a href="../validate/SqlValidatorScope.html" title="interface in org.apache.calcite.sql.validate">SqlValidatorScope</a> operandScope)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../SqlOperator.html#validateCall(org.apache.calcite.sql.SqlCall,org.apache.calcite.sql.validate.SqlValidator,org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.validate.SqlValidatorScope)">SqlOperator</a></code></span></div> |
| <div class="block">Validates a call to this operator. |
| |
| <p>This method should not perform type-derivation or perform validation |
| related related to types. That is done later, by |
| <a href="../SqlOperator.html#deriveType(org.apache.calcite.sql.validate.SqlValidator,org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.SqlCall)"><code>SqlOperator.deriveType(SqlValidator, SqlValidatorScope, SqlCall)</code></a>. This method |
| should focus on structural validation. |
| |
| <p>A typical implementation of this method first validates the operands, |
| then performs some operator-specific logic. The default implementation |
| just validates the operands. |
| |
| <p>This method is the default implementation of <a href="../SqlCall.html#validate(org.apache.calcite.sql.validate.SqlValidator,org.apache.calcite.sql.validate.SqlValidatorScope)"><code>SqlCall.validate(org.apache.calcite.sql.validate.SqlValidator, org.apache.calcite.sql.validate.SqlValidatorScope)</code></a>; |
| but note that some sub-classes of <a href="../SqlCall.html" title="class in org.apache.calcite.sql"><code>SqlCall</code></a> never call this method.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><a href="../SqlOperator.html#validateCall(org.apache.calcite.sql.SqlCall,org.apache.calcite.sql.validate.SqlValidator,org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.validate.SqlValidatorScope)">validateCall</a></code> in class <code><a href="../SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>call</code> - the call to this operator</dd> |
| <dd><code>validator</code> - the active validator</dd> |
| <dd><code>scope</code> - validator scope</dd> |
| <dd><code>operandScope</code> - validator scope in which to validate operands to this |
| call; usually equal to scope, but not always because |
| some operators introduce new scopes</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../SqlNode.html#validateExpr(org.apache.calcite.sql.validate.SqlValidator,org.apache.calcite.sql.validate.SqlValidatorScope)"><code>SqlNode.validateExpr(SqlValidator, SqlValidatorScope)</code></a>, |
| <a href="../SqlOperator.html#deriveType(org.apache.calcite.sql.validate.SqlValidator,org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.SqlCall)"><code>SqlOperator.deriveType(SqlValidator, SqlValidatorScope, SqlCall)</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="deriveType(org.apache.calcite.sql.validate.SqlValidator,org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.SqlCall)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>deriveType</h4> |
| <pre class="methodSignature">public <a href="../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a> deriveType​(<a href="../validate/SqlValidator.html" title="interface in org.apache.calcite.sql.validate">SqlValidator</a> validator, |
| <a href="../validate/SqlValidatorScope.html" title="interface in org.apache.calcite.sql.validate">SqlValidatorScope</a> scope, |
| <a href="../SqlCall.html" title="class in org.apache.calcite.sql">SqlCall</a> call)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../SqlOperator.html#deriveType(org.apache.calcite.sql.validate.SqlValidator,org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.SqlCall)">SqlOperator</a></code></span></div> |
| <div class="block">Derives the type of a call to this operator. |
| |
| <p>This method is an intrinsic part of the validation process so, unlike |
| <a href="../SqlOperator.html#inferReturnType(org.apache.calcite.sql.SqlOperatorBinding)"><code>SqlOperator.inferReturnType(org.apache.calcite.sql.SqlOperatorBinding)</code></a>, specific operators would not typically override |
| this method.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><a href="../SqlOperator.html#deriveType(org.apache.calcite.sql.validate.SqlValidator,org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.SqlCall)">deriveType</a></code> in class <code><a href="../SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>validator</code> - Validator</dd> |
| <dd><code>scope</code> - Scope of validation</dd> |
| <dd><code>call</code> - Call to this operator</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Type of call</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="checkOperandTypes(org.apache.calcite.sql.SqlCallBinding,boolean)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>checkOperandTypes</h4> |
| <pre class="methodSignature">public boolean checkOperandTypes​(<a href="../SqlCallBinding.html" title="class in org.apache.calcite.sql">SqlCallBinding</a> callBinding, |
| boolean throwOnFailure)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../SqlOperator.html#checkOperandTypes(org.apache.calcite.sql.SqlCallBinding,boolean)">SqlOperator</a></code></span></div> |
| <div class="block">Checks that the operand values in a <a href="../SqlCall.html" title="class in org.apache.calcite.sql"><code>SqlCall</code></a> to this operator are |
| valid. Subclasses must either override this method or supply an instance |
| of <a href="../type/SqlOperandTypeChecker.html" title="interface in org.apache.calcite.sql.type"><code>SqlOperandTypeChecker</code></a> to the constructor.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><a href="../SqlOperator.html#checkOperandTypes(org.apache.calcite.sql.SqlCallBinding,boolean)">checkOperandTypes</a></code> in class <code><a href="../SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>callBinding</code> - description of call</dd> |
| <dd><code>throwOnFailure</code> - whether to throw an exception if check fails |
| (otherwise returns false in that case)</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>whether check succeeded</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="inferReturnType(org.apache.calcite.sql.SqlOperatorBinding)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>inferReturnType</h4> |
| <pre class="methodSignature">public <a href="../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a> inferReturnType​(<a href="../SqlOperatorBinding.html" title="class in org.apache.calcite.sql">SqlOperatorBinding</a> opBinding)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../SqlOperator.html#inferReturnType(org.apache.calcite.sql.SqlOperatorBinding)">SqlOperator</a></code></span></div> |
| <div class="block">Infers the return type of an invocation of this operator; only called |
| after the number and types of operands have already been validated. |
| Subclasses must either override this method or supply an instance of |
| <a href="../type/SqlReturnTypeInference.html" title="interface in org.apache.calcite.sql.type"><code>SqlReturnTypeInference</code></a> to the constructor.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><a href="../SqlOperator.html#inferReturnType(org.apache.calcite.sql.SqlOperatorBinding)">inferReturnType</a></code> in class <code><a href="../SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>opBinding</code> - description of invocation (not necessarily a |
| <a href="../SqlCall.html" title="class in org.apache.calcite.sql"><code>SqlCall</code></a>)</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>inferred return type</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="inferTypeFromValidator(org.apache.calcite.sql.SqlCallBinding)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>inferTypeFromValidator</h4> |
| <pre class="methodSignature">private <a href="../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a> inferTypeFromValidator​(<a href="../SqlCallBinding.html" title="class in org.apache.calcite.sql">SqlCallBinding</a> callBinding)</pre> |
| </li> |
| </ul> |
| <a id="inferTypeFromOperands(org.apache.calcite.rel.type.RelDataTypeFactory,java.util.List)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>inferTypeFromOperands</h4> |
| <pre class="methodSignature">private <a href="../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a> inferTypeFromOperands​(<a href="../../rel/type/RelDataTypeFactory.html" title="interface in org.apache.calcite.rel.type">RelDataTypeFactory</a> typeFactory, |
| java.util.List<<a href="../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>> argTypes)</pre> |
| </li> |
| </ul> |
| <a id="getOperandCountRange()"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getOperandCountRange</h4> |
| <pre class="methodSignature">public <a href="../SqlOperandCountRange.html" title="interface in org.apache.calcite.sql">SqlOperandCountRange</a> getOperandCountRange()</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../SqlOperator.html#getOperandCountRange()">SqlOperator</a></code></span></div> |
| <div class="block">Returns a constraint on the number of operands expected by this operator. |
| Subclasses may override this method; when they don't, the range is |
| derived from the <a href="../type/SqlOperandTypeChecker.html" title="interface in org.apache.calcite.sql.type"><code>SqlOperandTypeChecker</code></a> associated with this |
| operator.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><a href="../SqlOperator.html#getOperandCountRange()">getOperandCountRange</a></code> in class <code><a href="../SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a></code></dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>acceptable range</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="getSyntax()"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getSyntax</h4> |
| <pre class="methodSignature">public <a href="../SqlSyntax.html" title="enum in org.apache.calcite.sql">SqlSyntax</a> getSyntax()</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../SqlOperator.html#getSyntax()">SqlOperator</a></code></span></div> |
| <div class="block">Returns the syntactic type of this operator, never null.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../SqlOperator.html#getSyntax()">getSyntax</a></code> in class <code><a href="../SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="createCall(org.apache.calcite.sql.SqlLiteral,org.apache.calcite.sql.parser.SqlParserPos,org.apache.calcite.sql.SqlNode...)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>createCall</h4> |
| <pre class="methodSignature">public <a href="../SqlCall.html" title="class in org.apache.calcite.sql">SqlCall</a> createCall​(<a href="../SqlLiteral.html" title="class in org.apache.calcite.sql">SqlLiteral</a> functionQualifier, |
| <a href="../parser/SqlParserPos.html" title="class in org.apache.calcite.sql.parser">SqlParserPos</a> pos, |
| <a href="../SqlNode.html" title="class in org.apache.calcite.sql">SqlNode</a>... operands)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../SqlOperator.html#createCall(org.apache.calcite.sql.SqlLiteral,org.apache.calcite.sql.parser.SqlParserPos,org.apache.calcite.sql.SqlNode...)">SqlOperator</a></code></span></div> |
| <div class="block">Creates a call to this operand with an array of operands. |
| |
| <p>The position of the resulting call is the union of the <code> |
| pos</code> and the positions of all of the operands.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><a href="../SqlOperator.html#createCall(org.apache.calcite.sql.SqlLiteral,org.apache.calcite.sql.parser.SqlParserPos,org.apache.calcite.sql.SqlNode...)">createCall</a></code> in class <code><a href="../SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>functionQualifier</code> - function qualifier (e.g. "DISTINCT"), may be</dd> |
| <dd><code>pos</code> - parser position of the identifier of the call</dd> |
| <dd><code>operands</code> - array of operands</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="unparse(org.apache.calcite.sql.SqlWriter,org.apache.calcite.sql.SqlCall,int,int)"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>unparse</h4> |
| <pre class="methodSignature">public void unparse​(<a href="../SqlWriter.html" title="interface in org.apache.calcite.sql">SqlWriter</a> writer, |
| <a href="../SqlCall.html" title="class in org.apache.calcite.sql">SqlCall</a> call_, |
| int leftPrec, |
| int rightPrec)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../SqlOperator.html#unparse(org.apache.calcite.sql.SqlWriter,org.apache.calcite.sql.SqlCall,int,int)">SqlOperator</a></code></span></div> |
| <div class="block">Writes a SQL representation of a call to this operator to a writer, |
| including parentheses if the operators on either side are of greater |
| precedence. |
| |
| <p>The default implementation of this method delegates to |
| <a href="../SqlSyntax.html#unparse(org.apache.calcite.sql.SqlWriter,org.apache.calcite.sql.SqlOperator,org.apache.calcite.sql.SqlCall,int,int)"><code>SqlSyntax.unparse(org.apache.calcite.sql.SqlWriter, org.apache.calcite.sql.SqlOperator, org.apache.calcite.sql.SqlCall, int, int)</code></a>.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><a href="../SqlOperator.html#unparse(org.apache.calcite.sql.SqlWriter,org.apache.calcite.sql.SqlCall,int,int)">unparse</a></code> in class <code><a href="../SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </section> |
| </li> |
| </ul> |
| </div> |
| </div> |
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