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<h2 title="Class SqlCoalesceFunction" class="title">Class SqlCoalesceFunction</h2>
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<pre>public class <span class="typeNameLabel">SqlCoalesceFunction</span>
extends <a href="../../../../../org/apache/calcite/sql/SqlFunction.html" title="class in org.apache.calcite.sql">SqlFunction</a></pre>
<div class="block">The <code>COALESCE</code> function.</div>
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<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>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/sql/fun/SqlCoalesceFunction.html#SqlCoalesceFunction--">SqlCoalesceFunction</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code><a href="../../../../../org/apache/calcite/sql/SqlNode.html" title="class in org.apache.calcite.sql">SqlNode</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/sql/fun/SqlCoalesceFunction.html#rewriteCall-org.apache.calcite.sql.validate.SqlValidator-org.apache.calcite.sql.SqlCall-">rewriteCall</a></span>(<a href="../../../../../org/apache/calcite/sql/validate/SqlValidator.html" title="interface in org.apache.calcite.sql.validate">SqlValidator</a>&nbsp;validator,
<a href="../../../../../org/apache/calcite/sql/SqlCall.html" title="class in org.apache.calcite.sql">SqlCall</a>&nbsp;call)</code>
<div class="block">Rewrites a call to this operator.</div>
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<code><a href="../../../../../org/apache/calcite/sql/SqlFunction.html#deriveType-org.apache.calcite.sql.validate.SqlValidator-org.apache.calcite.sql.validate.SqlValidatorScope-org.apache.calcite.sql.SqlCall-">deriveType</a>, <a href="../../../../../org/apache/calcite/sql/SqlFunction.html#getFunctionType--">getFunctionType</a>, <a href="../../../../../org/apache/calcite/sql/SqlFunction.html#getNameAsId--">getNameAsId</a>, <a href="../../../../../org/apache/calcite/sql/SqlFunction.html#getParamNames--">getParamNames</a>, <a href="../../../../../org/apache/calcite/sql/SqlFunction.html#getParamTypes--">getParamTypes</a>, <a href="../../../../../org/apache/calcite/sql/SqlFunction.html#getSqlIdentifier--">getSqlIdentifier</a>, <a href="../../../../../org/apache/calcite/sql/SqlFunction.html#getSyntax--">getSyntax</a>, <a href="../../../../../org/apache/calcite/sql/SqlFunction.html#isQuantifierAllowed--">isQuantifierAllowed</a>, <a href="../../../../../org/apache/calcite/sql/SqlFunction.html#unparse-org.apache.calcite.sql.SqlWriter-org.apache.calcite.sql.SqlCall-int-int-">unparse</a>, <a href="../../../../../org/apache/calcite/sql/SqlFunction.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>, <a href="../../../../../org/apache/calcite/sql/SqlFunction.html#validateQuantifier-org.apache.calcite.sql.validate.SqlValidator-org.apache.calcite.sql.SqlCall-">validateQuantifier</a></code></li>
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<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 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<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>
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<h4>SqlCoalesceFunction</h4>
<pre>public&nbsp;SqlCoalesceFunction()</pre>
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<h4>rewriteCall</h4>
<pre>public&nbsp;<a href="../../../../../org/apache/calcite/sql/SqlNode.html" title="class in org.apache.calcite.sql">SqlNode</a>&nbsp;rewriteCall(<a href="../../../../../org/apache/calcite/sql/validate/SqlValidator.html" title="interface in org.apache.calcite.sql.validate">SqlValidator</a>&nbsp;validator,
<a href="../../../../../org/apache/calcite/sql/SqlCall.html" title="class in org.apache.calcite.sql">SqlCall</a>&nbsp;call)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../org/apache/calcite/sql/SqlOperator.html#rewriteCall-org.apache.calcite.sql.validate.SqlValidator-org.apache.calcite.sql.SqlCall-">SqlOperator</a></code></span></div>
<div class="block">Rewrites a call to this operator. Some operators are implemented as
trivial rewrites (e.g. NULLIF becomes CASE). However, we don't do this at
createCall time because we want to preserve the original SQL syntax as
much as possible; instead, we do this before the call is validated (so
the trivial operator doesn't need its own implementation of type
derivation methods). The default implementation is to just return the
original call without any rewrite.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/sql/SqlOperator.html#rewriteCall-org.apache.calcite.sql.validate.SqlValidator-org.apache.calcite.sql.SqlCall-">rewriteCall</a></code>&nbsp;in class&nbsp;<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>call</code> - Call to be rewritten</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>rewritten call</dd>
</dl>
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