| <!DOCTYPE HTML> |
| <html lang="en"> |
| <head> |
| <!-- Generated by javadoc (17) --> |
| <title>SqlCaseOperator (Apache Calcite API)</title> |
| <meta name="viewport" content="width=device-width, initial-scale=1"> |
| <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> |
| <meta name="description" content="declaration: package: org.apache.calcite.sql.fun, class: SqlCaseOperator"> |
| <meta name="generator" content="javadoc/ClassWriterImpl"> |
| <link rel="stylesheet" type="text/css" href="../../../../../stylesheet.css" title="Style"> |
| <link rel="stylesheet" type="text/css" href="../../../../../script-dir/jquery-ui.min.css" title="Style"> |
| <link rel="stylesheet" type="text/css" href="../../../../../jquery-ui.overrides.css" title="Style"> |
| <script type="text/javascript" src="../../../../../script.js"></script> |
| <script type="text/javascript" src="../../../../../script-dir/jquery-3.5.1.min.js"></script> |
| <script type="text/javascript" src="../../../../../script-dir/jquery-ui.min.js"></script> |
| </head> |
| <body class="class-declaration-page"> |
| <script type="text/javascript">var evenRowColor = "even-row-color"; |
| var oddRowColor = "odd-row-color"; |
| var tableTab = "table-tab"; |
| var activeTableTab = "active-table-tab"; |
| var pathtoroot = "../../../../../"; |
| loadScripts(document, 'script');</script> |
| <noscript> |
| <div>JavaScript is disabled on your browser.</div> |
| </noscript> |
| <div class="flex-box"> |
| <header role="banner" class="flex-header"> |
| <nav role="navigation"> |
| <!-- ========= START OF TOP NAVBAR ======= --> |
| <div class="top-nav" id="navbar-top"> |
| <div class="skip-nav"><a href="#skip-navbar-top" title="Skip navigation links">Skip navigation links</a></div> |
| <div class="about-language"><b>Apache Calcite</b></div> |
| <ul id="navbar-top-firstrow" class="nav-list" title="Navigation"> |
| <li><a href="../../../../../index.html">Overview</a></li> |
| <li><a href="package-summary.html">Package</a></li> |
| <li class="nav-bar-cell1-rev">Class</li> |
| <li><a href="package-tree.html">Tree</a></li> |
| <li><a href="../../../../../deprecated-list.html">Deprecated</a></li> |
| <li><a href="../../../../../index-all.html">Index</a></li> |
| <li><a href="../../../../../help-doc.html#class">Help</a></li> |
| </ul> |
| </div> |
| <div class="sub-nav"> |
| <div> |
| <ul class="sub-nav-list"> |
| <li>Summary: </li> |
| <li>Nested | </li> |
| <li><a href="#field-summary">Field</a> | </li> |
| <li>Constr | </li> |
| <li><a href="#method-summary">Method</a></li> |
| </ul> |
| <ul class="sub-nav-list"> |
| <li>Detail: </li> |
| <li><a href="#field-detail">Field</a> | </li> |
| <li>Constr | </li> |
| <li><a href="#method-detail">Method</a></li> |
| </ul> |
| </div> |
| <div class="nav-list-search"><label for="search-input">SEARCH:</label> |
| <input type="text" id="search-input" value="search" disabled="disabled"> |
| <input type="reset" id="reset-button" value="reset" disabled="disabled"> |
| </div> |
| </div> |
| <!-- ========= END OF TOP NAVBAR ========= --> |
| <span class="skip-nav" id="skip-navbar-top"></span></nav> |
| </header> |
| <div class="flex-content"> |
| <main role="main"> |
| <!-- ======== START OF CLASS DATA ======== --> |
| <div class="header"> |
| <div class="sub-title"><span class="package-label-in-type">Package</span> <a href="package-summary.html">org.apache.calcite.sql.fun</a></div> |
| <h1 title="Class SqlCaseOperator" class="title">Class SqlCaseOperator</h1> |
| </div> |
| <div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a> |
| <div class="inheritance"><a href="../SqlOperator.html" title="class in org.apache.calcite.sql">org.apache.calcite.sql.SqlOperator</a> |
| <div class="inheritance">org.apache.calcite.sql.fun.SqlCaseOperator</div> |
| </div> |
| </div> |
| <section class="class-description" id="class-description"> |
| <hr> |
| <div class="type-signature"><span class="modifiers">public class </span><span class="element-name type-name-label">SqlCaseOperator</span> |
| <span class="extends-implements">extends <a href="../SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a></span></div> |
| <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> |
| </section> |
| <section class="summary"> |
| <ul class="summary-list"> |
| <!-- =========== FIELD SUMMARY =========== --> |
| <li> |
| <section class="field-summary" id="field-summary"> |
| <h2>Field Summary</h2> |
| <div class="caption"><span>Fields</span></div> |
| <div class="summary-table three-column-summary"> |
| <div class="table-header col-first">Modifier and Type</div> |
| <div class="table-header col-second">Field</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-first even-row-color"><code>static final <a href="SqlCaseOperator.html" title="class in org.apache.calcite.sql.fun">SqlCaseOperator</a></code></div> |
| <div class="col-second even-row-color"><code><a href="#INSTANCE" class="member-name-link">INSTANCE</a></code></div> |
| <div class="col-last even-row-color"> </div> |
| </div> |
| <div class="inherited-list"> |
| <h3 id="fields-inherited-from-class-org.apache.calcite.sql.SqlOperator">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></div> |
| </section> |
| </li> |
| <!-- ========== METHOD SUMMARY =========== --> |
| <li> |
| <section class="method-summary" id="method-summary"> |
| <h2>Method Summary</h2> |
| <div id="method-summary-table"> |
| <div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab2" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab2', 3)" class="table-tab">Instance Methods</button><button id="method-summary-table-tab4" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab4', 3)" class="table-tab">Concrete Methods</button></div> |
| <div id="method-summary-table.tabpanel" role="tabpanel"> |
| <div class="summary-table three-column-summary" aria-labelledby="method-summary-table-tab0"> |
| <div class="table-header col-first">Modifier and Type</div> |
| <div class="table-header col-second">Method</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>boolean</code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#checkOperandTypes(org.apache.calcite.sql.SqlCallBinding,boolean)" class="member-name-link">checkOperandTypes</a><wbr>(<a href="../SqlCallBinding.html" title="class in org.apache.calcite.sql">SqlCallBinding</a> callBinding, |
| boolean throwOnFailure)</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <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> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="../SqlCall.html" title="class in org.apache.calcite.sql">SqlCall</a></code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#createCall(org.apache.calcite.sql.SqlLiteral,org.apache.calcite.sql.parser.SqlParserPos,org.apache.calcite.sql.SqlNode...)" class="member-name-link">createCall</a><wbr>(@Nullable <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, |
| @Nullable <a href="../SqlNode.html" title="class in org.apache.calcite.sql">SqlNode</a>... operands)</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <div class="block">Creates a call to this operator with an array of operands.</div> |
| </div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#deriveType(org.apache.calcite.sql.validate.SqlValidator,org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.SqlCall)" class="member-name-link">deriveType</a><wbr>(<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></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <div class="block">Derives the type of a call to this operator.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="../SqlOperandCountRange.html" title="interface in org.apache.calcite.sql">SqlOperandCountRange</a></code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getOperandCountRange()" class="member-name-link">getOperandCountRange</a>()</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <div class="block">Returns a constraint on the number of operands expected by this operator.</div> |
| </div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="../SqlSyntax.html" title="enum in org.apache.calcite.sql">SqlSyntax</a></code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getSyntax()" class="member-name-link">getSyntax</a>()</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <div class="block">Returns the syntactic type of this operator, never null.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#inferReturnType(org.apache.calcite.sql.SqlOperatorBinding)" class="member-name-link">inferReturnType</a><wbr>(<a href="../SqlOperatorBinding.html" title="class in org.apache.calcite.sql">SqlOperatorBinding</a> opBinding)</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <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> |
| </div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#unparse(org.apache.calcite.sql.SqlWriter,org.apache.calcite.sql.SqlCall,int,int)" class="member-name-link">unparse</a><wbr>(<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></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <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> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><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)" class="member-name-link">validateCall</a><wbr>(<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></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <div class="block">Validates a call to this operator.</div> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="inherited-list"> |
| <h3 id="methods-inherited-from-class-org.apache.calcite.sql.SqlOperator">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.SqlLiteral,org.apache.calcite.sql.parser.SqlParserPos,java.lang.Iterable)">createCall</a>, <a href="../SqlOperator.html#createCall(org.apache.calcite.sql.SqlLiteral,org.apache.calcite.sql.parser.SqlParserPos,org.apache.calcite.sql.SqlNodeList)">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.parser.SqlParserPos,java.util.List)">createCall</a>, <a href="../SqlOperator.html#createCall(org.apache.calcite.sql.parser.SqlParserPos,org.apache.calcite.sql.SqlNodeList)">createCall</a>, <a href="../SqlOperator.html#createCall(org.apache.calcite.sql.SqlNodeList)">createCall</a>, <a href="../SqlOperator.html#deriveOperandType(org.apache.calcite.sql.validate.SqlValidator,org.apache.calcite.sql.validate.SqlValidatorScope,int,org.apache.calcite.sql.SqlNode)">deriveOperandType</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#getStrongPolicyInference()">getStrongPolicyInference</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#isSymmetrical()">isSymmetrical</a>, <a href="../SqlOperator.html#leftPrec(int,boolean)">leftPrec</a>, <a href="../SqlOperator.html#not()">not</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#reverse()">reverse</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></div> |
| <div class="inherited-list"> |
| <h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class java.lang.<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3> |
| <code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#clone()" title="class or interface in java.lang" class="external-link">clone</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#finalize()" title="class or interface in java.lang" class="external-link">finalize</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#getClass()" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notify()" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notifyAll()" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait()" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long)" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long,int)" title="class or interface in java.lang" class="external-link">wait</a></code></div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| <section class="details"> |
| <ul class="details-list"> |
| <!-- ============ FIELD DETAIL =========== --> |
| <li> |
| <section class="field-details" id="field-detail"> |
| <h2>Field Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="INSTANCE"> |
| <h3>INSTANCE</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type"><a href="SqlCaseOperator.html" title="class in org.apache.calcite.sql.fun">SqlCaseOperator</a></span> <span class="element-name">INSTANCE</span></div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
| <!-- ============ METHOD DETAIL ========== --> |
| <li> |
| <section class="method-details" id="method-detail"> |
| <h2>Method Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" 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)"> |
| <h3>validateCall</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type">void</span> <span class="element-name">validateCall</span><wbr><span class="parameters">(<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)</span></div> |
| <div class="block"><span class="descfrm-type-label">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 class="notes"> |
| <dt>Overrides:</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>Parameters:</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>See Also:</dt> |
| <dd> |
| <ul class="see-list-long"> |
| <li><a href="../SqlNode.html#validateExpr(org.apache.calcite.sql.validate.SqlValidator,org.apache.calcite.sql.validate.SqlValidatorScope)"><code>SqlNode.validateExpr(SqlValidator, SqlValidatorScope)</code></a></li> |
| <li><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></li> |
| </ul> |
| </dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="deriveType(org.apache.calcite.sql.validate.SqlValidator,org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.SqlCall)"> |
| <h3>deriveType</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type"><a href="../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></span> <span class="element-name">deriveType</span><wbr><span class="parameters">(<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)</span></div> |
| <div class="block"><span class="descfrm-type-label">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 class="notes"> |
| <dt>Overrides:</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>Parameters:</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>Returns:</dt> |
| <dd>Type of call</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="checkOperandTypes(org.apache.calcite.sql.SqlCallBinding,boolean)"> |
| <h3>checkOperandTypes</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type">boolean</span> <span class="element-name">checkOperandTypes</span><wbr><span class="parameters">(<a href="../SqlCallBinding.html" title="class in org.apache.calcite.sql">SqlCallBinding</a> callBinding, |
| boolean throwOnFailure)</span></div> |
| <div class="block"><span class="descfrm-type-label">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 class="notes"> |
| <dt>Overrides:</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>Parameters:</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>Returns:</dt> |
| <dd>whether check succeeded</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="inferReturnType(org.apache.calcite.sql.SqlOperatorBinding)"> |
| <h3>inferReturnType</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type"><a href="../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></span> <span class="element-name">inferReturnType</span><wbr><span class="parameters">(<a href="../SqlOperatorBinding.html" title="class in org.apache.calcite.sql">SqlOperatorBinding</a> opBinding)</span></div> |
| <div class="block"><span class="descfrm-type-label">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 class="notes"> |
| <dt>Overrides:</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>Parameters:</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>Returns:</dt> |
| <dd>inferred return type</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="getOperandCountRange()"> |
| <h3>getOperandCountRange</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type"><a href="../SqlOperandCountRange.html" title="interface in org.apache.calcite.sql">SqlOperandCountRange</a></span> <span class="element-name">getOperandCountRange</span>()</div> |
| <div class="block"><span class="descfrm-type-label">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 class="notes"> |
| <dt>Overrides:</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>Returns:</dt> |
| <dd>acceptable range</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="getSyntax()"> |
| <h3>getSyntax</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type"><a href="../SqlSyntax.html" title="enum in org.apache.calcite.sql">SqlSyntax</a></span> <span class="element-name">getSyntax</span>()</div> |
| <div class="block"><span class="descfrm-type-label">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 class="notes"> |
| <dt>Specified by:</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> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="createCall(org.apache.calcite.sql.SqlLiteral,org.apache.calcite.sql.parser.SqlParserPos,org.apache.calcite.sql.SqlNode...)"> |
| <h3>createCall</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type"><a href="../SqlCall.html" title="class in org.apache.calcite.sql">SqlCall</a></span> <span class="element-name">createCall</span><wbr><span class="parameters">(@Nullable <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, |
| @Nullable <a href="../SqlNode.html" title="class in org.apache.calcite.sql">SqlNode</a>... operands)</span></div> |
| <div class="block"><span class="descfrm-type-label">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 operator 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 class="notes"> |
| <dt>Overrides:</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>Parameters:</dt> |
| <dd><code>functionQualifier</code> - Function qualifier (e.g. "DISTINCT"), or null</dd> |
| <dd><code>pos</code> - Parser position of the identifier of the call</dd> |
| <dd><code>operands</code> - Array of operands</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="unparse(org.apache.calcite.sql.SqlWriter,org.apache.calcite.sql.SqlCall,int,int)"> |
| <h3>unparse</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type">void</span> <span class="element-name">unparse</span><wbr><span class="parameters">(<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)</span></div> |
| <div class="block"><span class="descfrm-type-label">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 class="notes"> |
| <dt>Overrides:</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> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
| </ul> |
| </section> |
| <!-- ========= END OF CLASS DATA ========= --> |
| </main> |
| <footer role="contentinfo"> |
| <hr> |
| <p class="legal-copy"><small>Copyright © 2012-2023 Apache Software Foundation. All Rights Reserved.</small></p> |
| </footer> |
| </div> |
| </div> |
| </body> |
| </html> |
