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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">org.apache.calcite.sql.validate.implicit</a></div>
<h2 title="Class AbstractTypeCoercion" class="title">Class AbstractTypeCoercion</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
<li>
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<li>org.apache.calcite.sql.validate.implicit.AbstractTypeCoercion</li>
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<dt>All Implemented Interfaces:</dt>
<dd><code><a href="TypeCoercion.html" title="interface in org.apache.calcite.sql.validate.implicit">TypeCoercion</a></code></dd>
</dl>
<dl>
<dt>Direct Known Subclasses:</dt>
<dd><code><a href="TypeCoercionImpl.html" title="class in org.apache.calcite.sql.validate.implicit">TypeCoercionImpl</a></code></dd>
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<pre>public abstract class <span class="typeNameLabel">AbstractTypeCoercion</span>
extends java.lang.Object
implements <a href="TypeCoercion.html" title="interface in org.apache.calcite.sql.validate.implicit">TypeCoercion</a></pre>
<div class="block">Base class for all the type coercion rules. If you want to have a custom type coercion rules,
inheriting this class is not necessary, but would have some convenient tool methods.
<p>We make tool methods: <a href="#coerceOperandType(org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.SqlCall,int,org.apache.calcite.rel.type.RelDataType)"><code>coerceOperandType(org.apache.calcite.sql.validate.SqlValidatorScope, org.apache.calcite.sql.SqlCall, int, org.apache.calcite.rel.type.RelDataType)</code></a>, <a href="#coerceColumnType(org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.SqlNodeList,int,org.apache.calcite.rel.type.RelDataType)"><code>coerceColumnType(org.apache.calcite.sql.validate.SqlValidatorScope, org.apache.calcite.sql.SqlNodeList, int, org.apache.calcite.rel.type.RelDataType)</code></a>,
<a href="#needToCast(org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.SqlNode,org.apache.calcite.rel.type.RelDataType)"><code>needToCast(org.apache.calcite.sql.validate.SqlValidatorScope, org.apache.calcite.sql.SqlNode, org.apache.calcite.rel.type.RelDataType)</code></a>, <a href="#updateInferredType(org.apache.calcite.sql.SqlNode,org.apache.calcite.rel.type.RelDataType)"><code>updateInferredType(org.apache.calcite.sql.SqlNode, org.apache.calcite.rel.type.RelDataType)</code></a>, <a href="#updateInferredColumnType(org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.SqlNode,int,org.apache.calcite.rel.type.RelDataType)"><code>updateInferredColumnType(org.apache.calcite.sql.validate.SqlValidatorScope, org.apache.calcite.sql.SqlNode, int, org.apache.calcite.rel.type.RelDataType)</code></a>
all overridable by derived classes, you can define system specific type coercion logic.
<p>Caution that these methods may modify the <a href="../../SqlNode.html" title="class in org.apache.calcite.sql"><code>SqlNode</code></a> tree, you should know what the
effect is when using these methods to customize your type coercion rules.</p>
<p>This class also defines the default implementation of the type widening strategies, see
<a href="TypeCoercion.html" title="interface in org.apache.calcite.sql.validate.implicit"><code>TypeCoercion</code></a> doc and methods: <a href="#getTightestCommonType(org.apache.calcite.rel.type.RelDataType,org.apache.calcite.rel.type.RelDataType)"><code>getTightestCommonType(org.apache.calcite.rel.type.RelDataType, org.apache.calcite.rel.type.RelDataType)</code></a>, <a href="#getWiderTypeFor(java.util.List,boolean)"><code>getWiderTypeFor(java.util.List&lt;org.apache.calcite.rel.type.RelDataType&gt;, boolean)</code></a>,
<a href="#getWiderTypeForTwo(org.apache.calcite.rel.type.RelDataType,org.apache.calcite.rel.type.RelDataType,boolean)"><code>getWiderTypeForTwo(org.apache.calcite.rel.type.RelDataType, org.apache.calcite.rel.type.RelDataType, boolean)</code></a>, <a href="#getWiderTypeForDecimal(org.apache.calcite.rel.type.RelDataType,org.apache.calcite.rel.type.RelDataType)"><code>getWiderTypeForDecimal(org.apache.calcite.rel.type.RelDataType, org.apache.calcite.rel.type.RelDataType)</code></a>,
<a href="#commonTypeForBinaryComparison(org.apache.calcite.rel.type.RelDataType,org.apache.calcite.rel.type.RelDataType)"><code>commonTypeForBinaryComparison(org.apache.calcite.rel.type.RelDataType, org.apache.calcite.rel.type.RelDataType)</code></a> for the detail strategies.</p></div>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Field</th>
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<td class="colFirst"><code>protected <a href="../../../rel/type/RelDataTypeFactory.html" title="interface in org.apache.calcite.rel.type">RelDataTypeFactory</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#factory">factory</a></span></code></th>
<td class="colLast">&nbsp;</td>
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<td class="colFirst"><code>protected <a href="../SqlValidator.html" title="interface in org.apache.calcite.sql.validate">SqlValidator</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#validator">validator</a></span></code></th>
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<th class="colFirst" scope="col">Constructor</th>
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<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(org.apache.calcite.sql.validate.SqlValidator)">AbstractTypeCoercion</a></span>&#8203;(<a href="../SqlValidator.html" title="interface in org.apache.calcite.sql.validate">SqlValidator</a>&nbsp;validator)</code></th>
<td class="colLast">&nbsp;</td>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Method</th>
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<td class="colFirst"><code>(package private) boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#canImplicitTypeCast(java.util.List,java.util.List)">canImplicitTypeCast</a></span>&#8203;(java.util.List&lt;<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&gt;&nbsp;types,
java.util.List&lt;<a href="../../type/SqlTypeFamily.html" title="enum in org.apache.calcite.sql.type">SqlTypeFamily</a>&gt;&nbsp;families)</code></th>
<td class="colLast">
<div class="block">Check if the types and families can have implicit type coercion.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>private <a href="../../SqlNode.html" title="class in org.apache.calcite.sql">SqlNode</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#castTo(org.apache.calcite.sql.SqlNode,org.apache.calcite.rel.type.RelDataType)">castTo</a></span>&#8203;(<a href="../../SqlNode.html" title="class in org.apache.calcite.sql">SqlNode</a>&nbsp;node,
<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;type)</code></th>
<td class="colLast">
<div class="block">It should not be used directly, because some other work should be done
before cast operation, see <a href="#coerceColumnType(org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.SqlNodeList,int,org.apache.calcite.rel.type.RelDataType)"><code>coerceColumnType(org.apache.calcite.sql.validate.SqlValidatorScope, org.apache.calcite.sql.SqlNodeList, int, org.apache.calcite.rel.type.RelDataType)</code></a>, <a href="#coerceOperandType(org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.SqlCall,int,org.apache.calcite.rel.type.RelDataType)"><code>coerceOperandType(org.apache.calcite.sql.validate.SqlValidatorScope, org.apache.calcite.sql.SqlCall, int, org.apache.calcite.rel.type.RelDataType)</code></a>.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>protected boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#coerceColumnType(org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.SqlNodeList,int,org.apache.calcite.rel.type.RelDataType)">coerceColumnType</a></span>&#8203;(<a href="../SqlValidatorScope.html" title="interface in org.apache.calcite.sql.validate">SqlValidatorScope</a>&nbsp;scope,
<a href="../../SqlNodeList.html" title="class in org.apache.calcite.sql">SqlNodeList</a>&nbsp;nodeList,
int&nbsp;index,
<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;targetType)</code></th>
<td class="colLast">
<div class="block">Cast column at index <code>index</code> to target type.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>protected boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#coerceOperandType(org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.SqlCall,int,org.apache.calcite.rel.type.RelDataType)">coerceOperandType</a></span>&#8203;(<a href="../SqlValidatorScope.html" title="interface in org.apache.calcite.sql.validate">SqlValidatorScope</a>&nbsp;scope,
<a href="../../SqlCall.html" title="class in org.apache.calcite.sql">SqlCall</a>&nbsp;call,
int&nbsp;index,
<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;targetType)</code></th>
<td class="colLast">
<div class="block">Cast operand at index <code>index</code> to target type.</div>
</td>
</tr>
<tr id="i4" 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="#commonTypeForBinaryComparison(org.apache.calcite.rel.type.RelDataType,org.apache.calcite.rel.type.RelDataType)">commonTypeForBinaryComparison</a></span>&#8203;(<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;type1,
<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;type2)</code></th>
<td class="colLast">
<div class="block">Determines common type for a comparison operator when one operand is String type and the
other is not.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code><a href="../../../rel/type/RelDataTypeFactory.html" title="interface in org.apache.calcite.rel.type">RelDataTypeFactory</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getFactory()">getFactory</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i6" 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="#getTightestCommonType(org.apache.calcite.rel.type.RelDataType,org.apache.calcite.rel.type.RelDataType)">getTightestCommonType</a></span>&#8203;(<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;type1,
<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;type2)</code></th>
<td class="colLast">
<div class="block">Case1: type widening with no precision loss.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code><a href="../SqlValidator.html" title="interface in org.apache.calcite.sql.validate">SqlValidator</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getValidator()">getValidator</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i8" 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="#getWiderTypeFor(java.util.List,boolean)">getWiderTypeFor</a></span>&#8203;(java.util.List&lt;<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&gt;&nbsp;typeList,
boolean&nbsp;stringPromotion)</code></th>
<td class="colLast">
<div class="block">Similar to <a href="#getWiderTypeForTwo(org.apache.calcite.rel.type.RelDataType,org.apache.calcite.rel.type.RelDataType,boolean)"><code>getWiderTypeForTwo(org.apache.calcite.rel.type.RelDataType, org.apache.calcite.rel.type.RelDataType, boolean)</code></a>, but can handle
sequence types.</div>
</td>
</tr>
<tr id="i9" 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="#getWiderTypeForDecimal(org.apache.calcite.rel.type.RelDataType,org.apache.calcite.rel.type.RelDataType)">getWiderTypeForDecimal</a></span>&#8203;(<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;type1,
<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;type2)</code></th>
<td class="colLast">
<div class="block">Finds a wider type when one or both types are decimal type.</div>
</td>
</tr>
<tr id="i10" 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="#getWiderTypeForTwo(org.apache.calcite.rel.type.RelDataType,org.apache.calcite.rel.type.RelDataType,boolean)">getWiderTypeForTwo</a></span>&#8203;(<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;type1,
<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;type2,
boolean&nbsp;stringPromotion)</code></th>
<td class="colLast">
<div class="block">Case2: type widening.</div>
</td>
</tr>
<tr id="i11" 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="#implicitCast(org.apache.calcite.rel.type.RelDataType,org.apache.calcite.sql.type.SqlTypeFamily)">implicitCast</a></span>&#8203;(<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;in,
<a href="../../type/SqlTypeFamily.html" title="enum in org.apache.calcite.sql.type">SqlTypeFamily</a>&nbsp;expected)</code></th>
<td class="colLast">
<div class="block">Type coercion based on the inferred type from passed in operand
and the <a href="../../type/SqlTypeFamily.html" title="enum in org.apache.calcite.sql.type"><code>SqlTypeFamily</code></a> defined in the checkers,
e.g.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>protected boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#needToCast(org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.SqlNode,org.apache.calcite.rel.type.RelDataType)">needToCast</a></span>&#8203;(<a href="../SqlValidatorScope.html" title="interface in org.apache.calcite.sql.validate">SqlValidatorScope</a>&nbsp;scope,
<a href="../../SqlNode.html" title="class in org.apache.calcite.sql">SqlNode</a>&nbsp;node1,
<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;targetType)</code></th>
<td class="colLast">
<div class="block">Decide if a SqlNode should be casted to target type, derived class
can override this strategy.</div>
</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code>private java.util.List&lt;<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#partitionByCharacter(java.util.List)">partitionByCharacter</a></span>&#8203;(java.util.List&lt;<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&gt;&nbsp;types)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i14" 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="#promoteToVarChar(org.apache.calcite.rel.type.RelDataType,org.apache.calcite.rel.type.RelDataType)">promoteToVarChar</a></span>&#8203;(<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;type1,
<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;type2)</code></th>
<td class="colLast">
<div class="block">Promote all the way to VARCHAR.</div>
</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code>(package 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="#syncAttributes(org.apache.calcite.rel.type.RelDataType,org.apache.calcite.rel.type.RelDataType)">syncAttributes</a></span>&#8203;(<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;type1,
<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;targetType)</code></th>
<td class="colLast">
<div class="block">Sync the data type additional attributes before casting,
i.e.</div>
</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code>protected void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#updateInferredColumnType(org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.SqlNode,int,org.apache.calcite.rel.type.RelDataType)">updateInferredColumnType</a></span>&#8203;(<a href="../SqlValidatorScope.html" title="interface in org.apache.calcite.sql.validate">SqlValidatorScope</a>&nbsp;scope,
<a href="../../SqlNode.html" title="class in org.apache.calcite.sql">SqlNode</a>&nbsp;query,
int&nbsp;columnIndex,
<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;targetType1)</code></th>
<td class="colLast">
<div class="block">Update inferred row type for a query, i.e.</div>
</td>
</tr>
<tr id="i17" class="rowColor">
<td class="colFirst"><code>protected void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#updateInferredType(org.apache.calcite.sql.SqlNode,org.apache.calcite.rel.type.RelDataType)">updateInferredType</a></span>&#8203;(<a href="../../SqlNode.html" title="class in org.apache.calcite.sql">SqlNode</a>&nbsp;node,
<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;type)</code></th>
<td class="colLast">
<div class="block">Update inferred type for a SqlNode.</div>
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<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
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<h3>Methods inherited from interface&nbsp;org.apache.calcite.sql.validate.implicit.<a href="TypeCoercion.html" title="interface in org.apache.calcite.sql.validate.implicit">TypeCoercion</a></h3>
<code><a href="TypeCoercion.html#binaryArithmeticCoercion(org.apache.calcite.sql.SqlCallBinding)">binaryArithmeticCoercion</a>, <a href="TypeCoercion.html#builtinFunctionCoercion(org.apache.calcite.sql.SqlCallBinding,java.util.List,java.util.List)">builtinFunctionCoercion</a>, <a href="TypeCoercion.html#caseWhenCoercion(org.apache.calcite.sql.SqlCallBinding)">caseWhenCoercion</a>, <a href="TypeCoercion.html#inOperationCoercion(org.apache.calcite.sql.SqlCallBinding)">inOperationCoercion</a>, <a href="TypeCoercion.html#rowTypeCoercion(org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.SqlNode,int,org.apache.calcite.rel.type.RelDataType)">rowTypeCoercion</a>, <a href="TypeCoercion.html#userDefinedFunctionCoercion(org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.SqlCall,org.apache.calcite.sql.SqlFunction)">userDefinedFunctionCoercion</a></code></li>
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<h3>Field Detail</h3>
<a id="validator">
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<h4>validator</h4>
<pre>protected&nbsp;<a href="../SqlValidator.html" title="interface in org.apache.calcite.sql.validate">SqlValidator</a> validator</pre>
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<pre>protected&nbsp;<a href="../../../rel/type/RelDataTypeFactory.html" title="interface in org.apache.calcite.rel.type">RelDataTypeFactory</a> factory</pre>
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<pre>AbstractTypeCoercion&#8203;(<a href="../SqlValidator.html" title="interface in org.apache.calcite.sql.validate">SqlValidator</a>&nbsp;validator)</pre>
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<pre class="methodSignature">public&nbsp;<a href="../../../rel/type/RelDataTypeFactory.html" title="interface in org.apache.calcite.rel.type">RelDataTypeFactory</a>&nbsp;getFactory()</pre>
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<pre class="methodSignature">public&nbsp;<a href="../SqlValidator.html" title="interface in org.apache.calcite.sql.validate">SqlValidator</a>&nbsp;getValidator()</pre>
</li>
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<a id="coerceOperandType(org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.SqlCall,int,org.apache.calcite.rel.type.RelDataType)">
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<h4>coerceOperandType</h4>
<pre class="methodSignature">protected&nbsp;boolean&nbsp;coerceOperandType&#8203;(<a href="../SqlValidatorScope.html" title="interface in org.apache.calcite.sql.validate">SqlValidatorScope</a>&nbsp;scope,
<a href="../../SqlCall.html" title="class in org.apache.calcite.sql">SqlCall</a>&nbsp;call,
int&nbsp;index,
<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;targetType)</pre>
<div class="block">Cast operand at index <code>index</code> to target type.
we do this base on the fact that validate happens before type coercion.</div>
</li>
</ul>
<a id="coerceColumnType(org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.SqlNodeList,int,org.apache.calcite.rel.type.RelDataType)">
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<pre class="methodSignature">protected&nbsp;boolean&nbsp;coerceColumnType&#8203;(<a href="../SqlValidatorScope.html" title="interface in org.apache.calcite.sql.validate">SqlValidatorScope</a>&nbsp;scope,
<a href="../../SqlNodeList.html" title="class in org.apache.calcite.sql">SqlNodeList</a>&nbsp;nodeList,
int&nbsp;index,
<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;targetType)</pre>
<div class="block">Cast column at index <code>index</code> to target type.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>scope</code> - validator scope for the node list</dd>
<dd><code>nodeList</code> - column node list</dd>
<dd><code>index</code> - index of column</dd>
<dd><code>targetType</code> - target type to cast to</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if type coercion actually happens.</dd>
</dl>
</li>
</ul>
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<pre class="methodSignature"><a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;syncAttributes&#8203;(<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;type1,
<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;targetType)</pre>
<div class="block">Sync the data type additional attributes before casting,
i.e. nullability, charset, collation.</div>
</li>
</ul>
<a id="needToCast(org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.SqlNode,org.apache.calcite.rel.type.RelDataType)">
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<h4>needToCast</h4>
<pre class="methodSignature">protected&nbsp;boolean&nbsp;needToCast&#8203;(<a href="../SqlValidatorScope.html" title="interface in org.apache.calcite.sql.validate">SqlValidatorScope</a>&nbsp;scope,
<a href="../../SqlNode.html" title="class in org.apache.calcite.sql">SqlNode</a>&nbsp;node1,
<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;targetType)</pre>
<div class="block">Decide if a SqlNode should be casted to target type, derived class
can override this strategy.</div>
</li>
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<pre class="methodSignature">private&nbsp;<a href="../../SqlNode.html" title="class in org.apache.calcite.sql">SqlNode</a>&nbsp;castTo&#8203;(<a href="../../SqlNode.html" title="class in org.apache.calcite.sql">SqlNode</a>&nbsp;node,
<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;type)</pre>
<div class="block">It should not be used directly, because some other work should be done
before cast operation, see <a href="#coerceColumnType(org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.SqlNodeList,int,org.apache.calcite.rel.type.RelDataType)"><code>coerceColumnType(org.apache.calcite.sql.validate.SqlValidatorScope, org.apache.calcite.sql.SqlNodeList, int, org.apache.calcite.rel.type.RelDataType)</code></a>, <a href="#coerceOperandType(org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.SqlCall,int,org.apache.calcite.rel.type.RelDataType)"><code>coerceOperandType(org.apache.calcite.sql.validate.SqlValidatorScope, org.apache.calcite.sql.SqlCall, int, org.apache.calcite.rel.type.RelDataType)</code></a>.
<p>Ignore constant reduction which should happen in RexSimplify.</div>
</li>
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<h4>updateInferredType</h4>
<pre class="methodSignature">protected&nbsp;void&nbsp;updateInferredType&#8203;(<a href="../../SqlNode.html" title="class in org.apache.calcite.sql">SqlNode</a>&nbsp;node,
<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;type)</pre>
<div class="block">Update inferred type for a SqlNode.</div>
</li>
</ul>
<a id="updateInferredColumnType(org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.SqlNode,int,org.apache.calcite.rel.type.RelDataType)">
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<h4>updateInferredColumnType</h4>
<pre class="methodSignature">protected&nbsp;void&nbsp;updateInferredColumnType&#8203;(<a href="../SqlValidatorScope.html" title="interface in org.apache.calcite.sql.validate">SqlValidatorScope</a>&nbsp;scope,
<a href="../../SqlNode.html" title="class in org.apache.calcite.sql">SqlNode</a>&nbsp;query,
int&nbsp;columnIndex,
<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;targetType1)</pre>
<div class="block">Update inferred row type for a query, i.e. SqlCall that returns struct type
or SqlSelect.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>scope</code> - validator scope</dd>
<dd><code>query</code> - node to inferred type</dd>
<dd><code>columnIndex</code> - column index to update</dd>
<dd><code>targetType1</code> - desired column type</dd>
</dl>
</li>
</ul>
<a id="getTightestCommonType(org.apache.calcite.rel.type.RelDataType,org.apache.calcite.rel.type.RelDataType)">
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<h4>getTightestCommonType</h4>
<pre class="methodSignature">public&nbsp;<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;getTightestCommonType&#8203;(<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;type1,
<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;type2)</pre>
<div class="block">Case1: type widening with no precision loss.
Find the tightest common type of two types that might be used in binary expression.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="TypeCoercion.html#getTightestCommonType(org.apache.calcite.rel.type.RelDataType,org.apache.calcite.rel.type.RelDataType)">getTightestCommonType</a></code>&nbsp;in interface&nbsp;<code><a href="TypeCoercion.html" title="interface in org.apache.calcite.sql.validate.implicit">TypeCoercion</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>tightest common type i.e. INTEGER + DECIMAL(10, 2) will return DECIMAL(10, 2)</dd>
</dl>
</li>
</ul>
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<h4>promoteToVarChar</h4>
<pre class="methodSignature">private&nbsp;<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;promoteToVarChar&#8203;(<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;type1,
<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;type2)</pre>
<div class="block">Promote all the way to VARCHAR.</div>
</li>
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<h4>commonTypeForBinaryComparison</h4>
<pre class="methodSignature">public&nbsp;<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;commonTypeForBinaryComparison&#8203;(<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;type1,
<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;type2)</pre>
<div class="block">Determines common type for a comparison operator when one operand is String type and the
other is not. For date + timestamp operands, use timestamp as common type,
i.e. Timestamp(2017-01-01 00:00 ...) &gt; Date(2018) evaluates to be false.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="TypeCoercion.html#commonTypeForBinaryComparison(org.apache.calcite.rel.type.RelDataType,org.apache.calcite.rel.type.RelDataType)">commonTypeForBinaryComparison</a></code>&nbsp;in interface&nbsp;<code><a href="TypeCoercion.html" title="interface in org.apache.calcite.sql.validate.implicit">TypeCoercion</a></code></dd>
</dl>
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<a id="getWiderTypeForTwo(org.apache.calcite.rel.type.RelDataType,org.apache.calcite.rel.type.RelDataType,boolean)">
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<h4>getWiderTypeForTwo</h4>
<pre class="methodSignature">public&nbsp;<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;getWiderTypeForTwo&#8203;(<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;type1,
<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;type2,
boolean&nbsp;stringPromotion)</pre>
<div class="block">Case2: type widening. The main difference with <a href="#getTightestCommonType(org.apache.calcite.rel.type.RelDataType,org.apache.calcite.rel.type.RelDataType)"><code>getTightestCommonType(org.apache.calcite.rel.type.RelDataType, org.apache.calcite.rel.type.RelDataType)</code></a>
is that we allow some precision loss when widening decimal to fractional,
or promote fractional to string type.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="TypeCoercion.html#getWiderTypeForTwo(org.apache.calcite.rel.type.RelDataType,org.apache.calcite.rel.type.RelDataType,boolean)">getWiderTypeForTwo</a></code>&nbsp;in interface&nbsp;<code><a href="TypeCoercion.html" title="interface in org.apache.calcite.sql.validate.implicit">TypeCoercion</a></code></dd>
</dl>
</li>
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<a id="getWiderTypeForDecimal(org.apache.calcite.rel.type.RelDataType,org.apache.calcite.rel.type.RelDataType)">
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<h4>getWiderTypeForDecimal</h4>
<pre class="methodSignature">public&nbsp;<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;getWiderTypeForDecimal&#8203;(<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;type1,
<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;type2)</pre>
<div class="block">Finds a wider type when one or both types are decimal type.
If the wider decimal type's precision/scale exceeds system limitation,
this rule will truncate the decimal type to the max precision/scale.
For decimal and fractional types, returns a decimal type
which has the higher precision of the two.
<p>The default implementation depends on the max precision/scale of the type system,
you can override it based on the specific system requirement in
<a href="../../../rel/type/RelDataTypeSystem.html" title="interface in org.apache.calcite.rel.type"><code>RelDataTypeSystem</code></a>.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="TypeCoercion.html#getWiderTypeForDecimal(org.apache.calcite.rel.type.RelDataType,org.apache.calcite.rel.type.RelDataType)">getWiderTypeForDecimal</a></code>&nbsp;in interface&nbsp;<code><a href="TypeCoercion.html" title="interface in org.apache.calcite.sql.validate.implicit">TypeCoercion</a></code></dd>
</dl>
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<a id="getWiderTypeFor(java.util.List,boolean)">
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<h4>getWiderTypeFor</h4>
<pre class="methodSignature">public&nbsp;<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;getWiderTypeFor&#8203;(java.util.List&lt;<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&gt;&nbsp;typeList,
boolean&nbsp;stringPromotion)</pre>
<div class="block">Similar to <a href="#getWiderTypeForTwo(org.apache.calcite.rel.type.RelDataType,org.apache.calcite.rel.type.RelDataType,boolean)"><code>getWiderTypeForTwo(org.apache.calcite.rel.type.RelDataType, org.apache.calcite.rel.type.RelDataType, boolean)</code></a>, but can handle
sequence types. <a href="#getWiderTypeForTwo(org.apache.calcite.rel.type.RelDataType,org.apache.calcite.rel.type.RelDataType,boolean)"><code>getWiderTypeForTwo(org.apache.calcite.rel.type.RelDataType, org.apache.calcite.rel.type.RelDataType, boolean)</code></a> doesn't satisfy the associative law,
i.e. (a op b) op c may not equal to a op (b op c). This is only a problem for STRING type or
nested STRING type in collection type like ARRAY. Excluding these types,
<a href="#getWiderTypeForTwo(org.apache.calcite.rel.type.RelDataType,org.apache.calcite.rel.type.RelDataType,boolean)"><code>getWiderTypeForTwo(org.apache.calcite.rel.type.RelDataType, org.apache.calcite.rel.type.RelDataType, boolean)</code></a> satisfies the associative law. For instance,
(DATE, INTEGER, VARCHAR) should have VARCHAR as the wider common type.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="TypeCoercion.html#getWiderTypeFor(java.util.List,boolean)">getWiderTypeFor</a></code>&nbsp;in interface&nbsp;<code><a href="TypeCoercion.html" title="interface in org.apache.calcite.sql.validate.implicit">TypeCoercion</a></code></dd>
</dl>
</li>
</ul>
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<h4>partitionByCharacter</h4>
<pre class="methodSignature">private&nbsp;java.util.List&lt;<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&gt;&nbsp;partitionByCharacter&#8203;(java.util.List&lt;<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&gt;&nbsp;types)</pre>
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<h4>canImplicitTypeCast</h4>
<pre class="methodSignature">boolean&nbsp;canImplicitTypeCast&#8203;(java.util.List&lt;<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&gt;&nbsp;types,
java.util.List&lt;<a href="../../type/SqlTypeFamily.html" title="enum in org.apache.calcite.sql.type">SqlTypeFamily</a>&gt;&nbsp;families)</pre>
<div class="block">Check if the types and families can have implicit type coercion.
We will check the type one by one, that means the 1th type and 1th family,
2th type and 2th family, and the like.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>types</code> - data type need to check.</dd>
<dd><code>families</code> - desired type families list.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if we can do type coercion.</dd>
</dl>
</li>
</ul>
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<pre class="methodSignature">public&nbsp;<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;implicitCast&#8203;(<a href="../../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;in,
<a href="../../type/SqlTypeFamily.html" title="enum in org.apache.calcite.sql.type">SqlTypeFamily</a>&nbsp;expected)</pre>
<div class="block">Type coercion based on the inferred type from passed in operand
and the <a href="../../type/SqlTypeFamily.html" title="enum in org.apache.calcite.sql.type"><code>SqlTypeFamily</code></a> defined in the checkers,
e.g. the <a href="../../type/FamilyOperandTypeChecker.html" title="class in org.apache.calcite.sql.type"><code>FamilyOperandTypeChecker</code></a>.
<p>Caution that we do not cast from NUMERIC to NUMERIC.
See <a href="https://docs.google.com/spreadsheets/d/1GhleX5h5W8-kJKh7NMJ4vtoE78pwfaZRJl88ULX_MgU/edit?usp=sharing">CalciteImplicitCasts</a>
for the details.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>in</code> - inferred operand type.</dd>
<dd><code>expected</code> - expected <a href="../../type/SqlTypeFamily.html" title="enum in org.apache.calcite.sql.type"><code>SqlTypeFamily</code></a> of registered SqlFunction.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>common type of implicit cast, null if we do not find any.</dd>
</dl>
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