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| <div class="subTitle">org.apache.calcite.sql.fun</div> |
| <h2 title="Class SqlCaseOperator" class="title">Class SqlCaseOperator</h2> |
| </div> |
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| <ul class="inheritance"> |
| <li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li><a href="../../../../../org/apache/calcite/sql/SqlOperator.html" title="class in org.apache.calcite.sql">org.apache.calcite.sql.SqlOperator</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.calcite.sql.fun.SqlCaseOperator</li> |
| </ul> |
| </li> |
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| <br> |
| <pre>public class <span class="typeNameLabel">SqlCaseOperator</span> |
| extends <a href="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/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="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/SqlNode.html" title="class in org.apache.calcite.sql"><code>SqlNode</code></a>.</li> |
| </ul></div> |
| </li> |
| </ul> |
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| <h3>Field Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Field Summary table, listing fields, and an explanation"> |
| <caption><span>Fields</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Field and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static <a href="../../../../../org/apache/calcite/sql/fun/SqlCaseOperator.html" title="class in org.apache.calcite.sql.fun">SqlCaseOperator</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/sql/fun/SqlCaseOperator.html#INSTANCE">INSTANCE</a></span></code> </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
| <li class="blockList"><a name="fields.inherited.from.class.org.apache.calcite.sql.SqlOperator"> |
| <!-- --> |
| </a> |
| <h3>Fields inherited from class org.apache.calcite.sql.<a href="../../../../../org/apache/calcite/sql/SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a></h3> |
| <code><a href="../../../../../org/apache/calcite/sql/SqlOperator.html#kind">kind</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#MDX_PRECEDENCE">MDX_PRECEDENCE</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#NL">NL</a></code></li> |
| </ul> |
| </li> |
| </ul> |
| <!-- ========== METHOD SUMMARY =========== --> |
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| </a> |
| <h3>Method Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/sql/fun/SqlCaseOperator.html#checkOperandTypes-org.apache.calcite.sql.SqlCallBinding-boolean-">checkOperandTypes</a></span>(<a href="../../../../../org/apache/calcite/sql/SqlCallBinding.html" title="class in org.apache.calcite.sql">SqlCallBinding</a> callBinding, |
| boolean throwOnFailure)</code> |
| <div class="block">Checks that the operand values in a <a href="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/SqlCall.html" title="class in org.apache.calcite.sql">SqlCall</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/sql/fun/SqlCaseOperator.html#createCall-org.apache.calcite.sql.SqlLiteral-org.apache.calcite.sql.parser.SqlParserPos-org.apache.calcite.sql.SqlNode...-">createCall</a></span>(<a href="../../../../../org/apache/calcite/sql/SqlLiteral.html" title="class in org.apache.calcite.sql">SqlLiteral</a> functionQualifier, |
| <a href="../../../../../org/apache/calcite/sql/parser/SqlParserPos.html" title="class in org.apache.calcite.sql.parser">SqlParserPos</a> pos, |
| <a href="../../../../../org/apache/calcite/sql/SqlNode.html" title="class in org.apache.calcite.sql">SqlNode</a>... operands)</code> |
| <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="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/sql/fun/SqlCaseOperator.html#deriveType-org.apache.calcite.sql.validate.SqlValidator-org.apache.calcite.sql.validate.SqlValidatorScope-org.apache.calcite.sql.SqlCall-">deriveType</a></span>(<a href="../../../../../org/apache/calcite/sql/validate/SqlValidator.html" title="interface in org.apache.calcite.sql.validate">SqlValidator</a> validator, |
| <a href="../../../../../org/apache/calcite/sql/validate/SqlValidatorScope.html" title="interface in org.apache.calcite.sql.validate">SqlValidatorScope</a> scope, |
| <a href="../../../../../org/apache/calcite/sql/SqlCall.html" title="class in org.apache.calcite.sql">SqlCall</a> call)</code> |
| <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="../../../../../org/apache/calcite/sql/SqlOperandCountRange.html" title="interface in org.apache.calcite.sql">SqlOperandCountRange</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/sql/fun/SqlCaseOperator.html#getOperandCountRange--">getOperandCountRange</a></span>()</code> |
| <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="../../../../../org/apache/calcite/sql/SqlSyntax.html" title="enum in org.apache.calcite.sql">SqlSyntax</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/sql/fun/SqlCaseOperator.html#getSyntax--">getSyntax</a></span>()</code> |
| <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="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/sql/fun/SqlCaseOperator.html#inferReturnType-org.apache.calcite.sql.SqlOperatorBinding-">inferReturnType</a></span>(<a href="../../../../../org/apache/calcite/sql/SqlOperatorBinding.html" title="class in org.apache.calcite.sql">SqlOperatorBinding</a> opBinding)</code> |
| <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>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/sql/fun/SqlCaseOperator.html#unparse-org.apache.calcite.sql.SqlWriter-org.apache.calcite.sql.SqlCall-int-int-">unparse</a></span>(<a href="../../../../../org/apache/calcite/sql/SqlWriter.html" title="interface in org.apache.calcite.sql">SqlWriter</a> writer, |
| <a href="../../../../../org/apache/calcite/sql/SqlCall.html" title="class in org.apache.calcite.sql">SqlCall</a> call_, |
| int leftPrec, |
| int rightPrec)</code> |
| <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="i7" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/sql/fun/SqlCaseOperator.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></span>(<a href="../../../../../org/apache/calcite/sql/SqlCall.html" title="class in org.apache.calcite.sql">SqlCall</a> call, |
| <a href="../../../../../org/apache/calcite/sql/validate/SqlValidator.html" title="interface in org.apache.calcite.sql.validate">SqlValidator</a> validator, |
| <a href="../../../../../org/apache/calcite/sql/validate/SqlValidatorScope.html" title="interface in org.apache.calcite.sql.validate">SqlValidatorScope</a> scope, |
| <a href="../../../../../org/apache/calcite/sql/validate/SqlValidatorScope.html" title="interface in org.apache.calcite.sql.validate">SqlValidatorScope</a> operandScope)</code> |
| <div class="block">Validates a call to this operator.</div> |
| </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
| <li class="blockList"><a name="methods.inherited.from.class.org.apache.calcite.sql.SqlOperator"> |
| <!-- --> |
| </a> |
| <h3>Methods inherited from class org.apache.calcite.sql.<a href="../../../../../org/apache/calcite/sql/SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a></h3> |
| <code><a href="../../../../../org/apache/calcite/sql/SqlOperator.html#acceptCall-org.apache.calcite.sql.util.SqlVisitor-org.apache.calcite.sql.SqlCall-">acceptCall</a>, <a href="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/SqlOperator.html#adjustType-org.apache.calcite.sql.validate.SqlValidator-org.apache.calcite.sql.SqlCall-org.apache.calcite.rel.type.RelDataType-">adjustType</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#allowsFraming--">allowsFraming</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#argumentMustBeScalar-int-">argumentMustBeScalar</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#checkOperandCount-org.apache.calcite.sql.validate.SqlValidator-org.apache.calcite.sql.type.SqlOperandTypeChecker-org.apache.calcite.sql.SqlCall-">checkOperandCount</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#constructArgNameList-org.apache.calcite.sql.SqlCall-">constructArgNameList</a>, <a href="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/SqlOperator.html#constructOperandList-org.apache.calcite.sql.validate.SqlValidator-org.apache.calcite.sql.SqlCall-java.util.List-">constructOperandList</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#createCall-org.apache.calcite.sql.SqlNodeList-">createCall</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#createCall-org.apache.calcite.sql.parser.SqlParserPos-java.util.List-">createCall</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#createCall-org.apache.calcite.sql.parser.SqlParserPos-org.apache.calcite.sql.SqlNode...-">createCall</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#equals-java.lang.Object-">equals</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#getAllowedSignatures--">getAllowedSignatures</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#getAllowedSignatures-java.lang.String-">getAllowedSignatures</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#getKind--">getKind</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#getLeftPrec--">getLeftPrec</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#getMonotonicity-org.apache.calcite.sql.SqlCall-org.apache.calcite.sql.validate.SqlValidatorScope-">getMonotonicity</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#getMonotonicity-org.apache.calcite.sql.SqlOperatorBinding-">getMonotonicity</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#getName--">getName</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#getNameAsId--">getNameAsId</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#getOperandTypeChecker--">getOperandTypeChecker</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#getOperandTypeInference--">getOperandTypeInference</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#getReturnTypeInference--">getReturnTypeInference</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#getRightPrec--">getRightPrec</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#getSignatureTemplate-int-">getSignatureTemplate</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#getStrongPolicyInference--">getStrongPolicyInference</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#hashCode--">hashCode</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#inferReturnType-org.apache.calcite.rel.type.RelDataTypeFactory-java.util.List-">inferReturnType</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#isAggregator--">isAggregator</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#isDeterministic--">isDeterministic</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#isDynamicFunction--">isDynamicFunction</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#isGroup--">isGroup</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#isGroupAuxiliary--">isGroupAuxiliary</a>, <a 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href="../../../../../org/apache/calcite/sql/SqlOperator.html#rewriteCall-org.apache.calcite.sql.validate.SqlValidator-org.apache.calcite.sql.SqlCall-">rewriteCall</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#rightPrec-int-boolean-">rightPrec</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#toString--">toString</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#unparseListClause-org.apache.calcite.sql.SqlWriter-org.apache.calcite.sql.SqlNode-">unparseListClause</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#unparseListClause-org.apache.calcite.sql.SqlWriter-org.apache.calcite.sql.SqlNode-org.apache.calcite.sql.SqlKind-">unparseListClause</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#validateOperands-org.apache.calcite.sql.validate.SqlValidator-org.apache.calcite.sql.validate.SqlValidatorScope-org.apache.calcite.sql.SqlCall-">validateOperands</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#validRexOperands-int-org.apache.calcite.util.Litmus-">validRexOperands</a></code></li> |
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| <h3>Methods inherited from class java.lang.<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></h3> |
| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li> |
| </ul> |
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| <h4>INSTANCE</h4> |
| <pre>public static final <a href="../../../../../org/apache/calcite/sql/fun/SqlCaseOperator.html" title="class in org.apache.calcite.sql.fun">SqlCaseOperator</a> INSTANCE</pre> |
| </li> |
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| <h3>Method Detail</h3> |
| <a name="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>public void validateCall(<a href="../../../../../org/apache/calcite/sql/SqlCall.html" title="class in org.apache.calcite.sql">SqlCall</a> call, |
| <a href="../../../../../org/apache/calcite/sql/validate/SqlValidator.html" title="interface in org.apache.calcite.sql.validate">SqlValidator</a> validator, |
| <a href="../../../../../org/apache/calcite/sql/validate/SqlValidatorScope.html" title="interface in org.apache.calcite.sql.validate">SqlValidatorScope</a> scope, |
| <a href="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/SqlNode.html#validateExpr-org.apache.calcite.sql.validate.SqlValidator-org.apache.calcite.sql.validate.SqlValidatorScope-"><code>SqlNode.validateExpr(SqlValidator, SqlValidatorScope)</code></a>, |
| <a href="../../../../../org/apache/calcite/sql/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 name="deriveType-org.apache.calcite.sql.validate.SqlValidator-org.apache.calcite.sql.validate.SqlValidatorScope-org.apache.calcite.sql.SqlCall-"> |
| <!-- --> |
| </a> |
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| <h4>deriveType</h4> |
| <pre>public <a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a> deriveType(<a href="../../../../../org/apache/calcite/sql/validate/SqlValidator.html" title="interface in org.apache.calcite.sql.validate">SqlValidator</a> validator, |
| <a href="../../../../../org/apache/calcite/sql/validate/SqlValidatorScope.html" title="interface in org.apache.calcite.sql.validate">SqlValidatorScope</a> scope, |
| <a href="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/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 name="checkOperandTypes-org.apache.calcite.sql.SqlCallBinding-boolean-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>checkOperandTypes</h4> |
| <pre>public boolean checkOperandTypes(<a href="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/SqlOperator.html#checkOperandTypes-org.apache.calcite.sql.SqlCallBinding-boolean-">checkOperandTypes</a></code> in class <code><a href="../../../../../org/apache/calcite/sql/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 name="inferReturnType-org.apache.calcite.sql.SqlOperatorBinding-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
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| <h4>inferReturnType</h4> |
| <pre>public <a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a> inferReturnType(<a href="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/SqlOperator.html#inferReturnType-org.apache.calcite.sql.SqlOperatorBinding-">inferReturnType</a></code> in class <code><a href="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/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 name="getOperandCountRange--"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getOperandCountRange</h4> |
| <pre>public <a href="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/SqlOperator.html#getOperandCountRange--">getOperandCountRange</a></code> in class <code><a href="../../../../../org/apache/calcite/sql/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 name="getSyntax--"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getSyntax</h4> |
| <pre>public <a href="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/SqlOperator.html#getSyntax--">getSyntax</a></code> in class <code><a href="../../../../../org/apache/calcite/sql/SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="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>public <a href="../../../../../org/apache/calcite/sql/SqlCall.html" title="class in org.apache.calcite.sql">SqlCall</a> createCall(<a href="../../../../../org/apache/calcite/sql/SqlLiteral.html" title="class in org.apache.calcite.sql">SqlLiteral</a> functionQualifier, |
| <a href="../../../../../org/apache/calcite/sql/parser/SqlParserPos.html" title="class in org.apache.calcite.sql.parser">SqlParserPos</a> pos, |
| <a href="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/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 name="unparse-org.apache.calcite.sql.SqlWriter-org.apache.calcite.sql.SqlCall-int-int-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>unparse</h4> |
| <pre>public void unparse(<a href="../../../../../org/apache/calcite/sql/SqlWriter.html" title="interface in org.apache.calcite.sql">SqlWriter</a> writer, |
| <a href="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/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="../../../../../org/apache/calcite/sql/SqlOperator.html#unparse-org.apache.calcite.sql.SqlWriter-org.apache.calcite.sql.SqlCall-int-int-">unparse</a></code> in class <code><a href="../../../../../org/apache/calcite/sql/SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
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