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| <li>概要: </li> |
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| <div class="subTitle">org.apache.calcite.sql.validate.implicit</div> |
| <h2 title="接口 TypeCoercion" class="title">接口 TypeCoercion</h2> |
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| <dt>所有已知实现类:</dt> |
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| <pre>public interface <span class="typeNameLabel">TypeCoercion</span></pre> |
| <div class="block">Default strategies to coerce differing types that participate in |
| operations into compatible ones. |
| |
| <p>Notes about type widening / tightest common types: Broadly, there are two cases that need |
| to widen data types (i.e. set operations, binary comparison): |
| |
| <ul> |
| <li>Case1: Look for a common data type for two or more data types, |
| and no loss of precision is allowed. Including type inference for returned/operands |
| type (i.e. what's the column's common data type if one row is an integer while the |
| other row is a long?).</li> |
| <li>Case2: Look for a widen data type with some acceptable loss of precision |
| (i.e. there is no common type for double and decimal because double's range is larger than |
| decimal(with default max precision), and yet decimal is more precise than double, |
| but in union we would cast the decimal to double).</li> |
| </ul> |
| |
| <p>REFERENCE: <a href="https://docs.microsoft.com/en-us/sql/t-sql/data-types/data-type-conversion-database-engine?">SQL-SERVER</a> |
| <a href="https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Types">HIVE</a></p></div> |
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| <h3>方法概要</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="方法概要表, 列表方法和解释"> |
| <caption><span id="t0" class="activeTableTab"><span>所有方法</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">实例方法</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">抽象方法</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">限定符和类型</th> |
| <th class="colLast" scope="col">方法和说明</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/validate/implicit/TypeCoercion.html#binaryArithmeticCoercion-org.apache.calcite.sql.SqlCallBinding-">binaryArithmeticCoercion</a></span>(<a href="../../../../../../org/apache/calcite/sql/SqlCallBinding.html" title="org.apache.calcite.sql中的类">SqlCallBinding</a> binding)</code> |
| <div class="block">Coerce operand of binary arithmetic expressions to Numeric type.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/calcite/sql/validate/implicit/TypeCoercion.html#binaryComparisonCoercion-org.apache.calcite.sql.SqlCallBinding-">binaryComparisonCoercion</a></span>(<a href="../../../../../../org/apache/calcite/sql/SqlCallBinding.html" title="org.apache.calcite.sql中的类">SqlCallBinding</a> binding)</code> |
| <div class="block">Coerce operands in binary comparison expressions.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/calcite/sql/validate/implicit/TypeCoercion.html#builtinFunctionCoercion-org.apache.calcite.sql.SqlCallBinding-java.util.List-java.util.List-">builtinFunctionCoercion</a></span>(<a href="../../../../../../org/apache/calcite/sql/SqlCallBinding.html" title="org.apache.calcite.sql中的类">SqlCallBinding</a> binding, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="java.util中的类或接口">List</a><<a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a>> operandTypes, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="java.util中的类或接口">List</a><<a href="../../../../../../org/apache/calcite/sql/type/SqlTypeFamily.html" title="org.apache.calcite.sql.type中的枚举">SqlTypeFamily</a>> expectedFamilies)</code> |
| <div class="block">Type coercion with inferred type from passed in arguments and the |
| <a href="../../../../../../org/apache/calcite/sql/type/SqlTypeFamily.html" title="org.apache.calcite.sql.type中的枚举"><code>SqlTypeFamily</code></a> defined in the checkers, e.g. the |
| <a href="../../../../../../org/apache/calcite/sql/type/FamilyOperandTypeChecker.html" title="org.apache.calcite.sql.type中的类"><code>FamilyOperandTypeChecker</code></a>.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/calcite/sql/validate/implicit/TypeCoercion.html#caseWhenCoercion-org.apache.calcite.sql.SqlCallBinding-">caseWhenCoercion</a></span>(<a href="../../../../../../org/apache/calcite/sql/SqlCallBinding.html" title="org.apache.calcite.sql中的类">SqlCallBinding</a> binding)</code> |
| <div class="block">Coerce CASE WHEN statement branches to one common type.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/calcite/sql/validate/implicit/TypeCoercion.html#commonTypeForBinaryComparison-org.apache.calcite.rel.type.RelDataType-org.apache.calcite.rel.type.RelDataType-">commonTypeForBinaryComparison</a></span>(<a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> type1, |
| <a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> type2)</code> |
| <div class="block">Determines common type for a comparison operator whose operands are STRING |
| type and the other (non STRING) type.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/calcite/sql/validate/implicit/TypeCoercion.html#getTightestCommonType-org.apache.calcite.rel.type.RelDataType-org.apache.calcite.rel.type.RelDataType-">getTightestCommonType</a></span>(<a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> type1, |
| <a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> type2)</code> |
| <div class="block">Case1: type widening with no precision loss.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/calcite/sql/validate/implicit/TypeCoercion.html#getWiderTypeFor-java.util.List-boolean-">getWiderTypeFor</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="java.util中的类或接口">List</a><<a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a>> typeList, |
| boolean stringPromotion)</code> |
| <div class="block">Similar to <a href="../../../../../../org/apache/calcite/sql/validate/implicit/TypeCoercion.html#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="i7" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/calcite/sql/validate/implicit/TypeCoercion.html#getWiderTypeForDecimal-org.apache.calcite.rel.type.RelDataType-org.apache.calcite.rel.type.RelDataType-">getWiderTypeForDecimal</a></span>(<a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> type1, |
| <a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> type2)</code> |
| <div class="block">Finds a wider type when one or both types are DECIMAL type.</div> |
| </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/calcite/sql/validate/implicit/TypeCoercion.html#getWiderTypeForTwo-org.apache.calcite.rel.type.RelDataType-org.apache.calcite.rel.type.RelDataType-boolean-">getWiderTypeForTwo</a></span>(<a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> type1, |
| <a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> type2, |
| boolean stringPromotion)</code> |
| <div class="block">Case2: type widening.</div> |
| </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/calcite/sql/validate/implicit/TypeCoercion.html#inOperationCoercion-org.apache.calcite.sql.SqlCallBinding-">inOperationCoercion</a></span>(<a href="../../../../../../org/apache/calcite/sql/SqlCallBinding.html" title="org.apache.calcite.sql中的类">SqlCallBinding</a> binding)</code> |
| <div class="block">Handles type coercion for IN operation with or without sub-query.</div> |
| </td> |
| </tr> |
| <tr id="i10" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/calcite/sql/validate/implicit/TypeCoercion.html#querySourceCoercion-org.apache.calcite.sql.validate.SqlValidatorScope-org.apache.calcite.rel.type.RelDataType-org.apache.calcite.rel.type.RelDataType-org.apache.calcite.sql.SqlNode-">querySourceCoercion</a></span>(<a href="../../../../../../org/apache/calcite/sql/validate/SqlValidatorScope.html" title="org.apache.calcite.sql.validate中的接口">SqlValidatorScope</a> scope, |
| <a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> sourceRowType, |
| <a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> targetRowType, |
| <a href="../../../../../../org/apache/calcite/sql/SqlNode.html" title="org.apache.calcite.sql中的类">SqlNode</a> query)</code> |
| <div class="block">Coerces the source row expression to target type in an INSERT or UPDATE query.</div> |
| </td> |
| </tr> |
| <tr id="i11" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/calcite/sql/validate/implicit/TypeCoercion.html#rowTypeCoercion-org.apache.calcite.sql.validate.SqlValidatorScope-org.apache.calcite.sql.SqlNode-int-org.apache.calcite.rel.type.RelDataType-">rowTypeCoercion</a></span>(<a href="../../../../../../org/apache/calcite/sql/validate/SqlValidatorScope.html" title="org.apache.calcite.sql.validate中的接口">SqlValidatorScope</a> scope, |
| <a href="../../../../../../org/apache/calcite/sql/SqlNode.html" title="org.apache.calcite.sql中的类">SqlNode</a> query, |
| int columnIndex, |
| <a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> targetType)</code> |
| <div class="block">Widen a SqlNode ith column type to target type, mainly used for set |
| operations like UNION, INTERSECT and EXCEPT.</div> |
| </td> |
| </tr> |
| <tr id="i12" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/calcite/sql/validate/implicit/TypeCoercion.html#userDefinedFunctionCoercion-org.apache.calcite.sql.validate.SqlValidatorScope-org.apache.calcite.sql.SqlCall-org.apache.calcite.sql.SqlFunction-">userDefinedFunctionCoercion</a></span>(<a href="../../../../../../org/apache/calcite/sql/validate/SqlValidatorScope.html" title="org.apache.calcite.sql.validate中的接口">SqlValidatorScope</a> scope, |
| <a href="../../../../../../org/apache/calcite/sql/SqlCall.html" title="org.apache.calcite.sql中的类">SqlCall</a> call, |
| <a href="../../../../../../org/apache/calcite/sql/SqlFunction.html" title="org.apache.calcite.sql中的类">SqlFunction</a> function)</code> |
| <div class="block">Non built-in functions (UDFs) type coercion, compare the types of arguments |
| with rules: |
| |
| |
| named param: find the desired type by the passed in operand's name |
| non-named param: find the desired type by formal parameter ordinal |
| |
| |
| Try to make type coercion only of the desired type is found.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ============ METHOD DETAIL ========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="method.detail"> |
| <!-- --> |
| </a> |
| <h3>方法详细资料</h3> |
| <a name="getTightestCommonType-org.apache.calcite.rel.type.RelDataType-org.apache.calcite.rel.type.RelDataType-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getTightestCommonType</h4> |
| <pre><a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> getTightestCommonType(<a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> type1, |
| <a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> 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="returnLabel">返回:</span></dt> |
| <dd>common type</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getWiderTypeForTwo-org.apache.calcite.rel.type.RelDataType-org.apache.calcite.rel.type.RelDataType-boolean-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getWiderTypeForTwo</h4> |
| <pre><a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> getWiderTypeForTwo(<a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> type1, |
| <a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> type2, |
| boolean stringPromotion)</pre> |
| <div class="block">Case2: type widening. The main difference with |
| <a href="../../../../../../org/apache/calcite/sql/validate/implicit/TypeCoercion.html#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 to string type.</div> |
| </li> |
| </ul> |
| <a name="getWiderTypeFor-java.util.List-boolean-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getWiderTypeFor</h4> |
| <pre><a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> getWiderTypeFor(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="java.util中的类或接口">List</a><<a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a>> typeList, |
| boolean stringPromotion)</pre> |
| <div class="block">Similar to <a href="../../../../../../org/apache/calcite/sql/validate/implicit/TypeCoercion.html#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="../../../../../../org/apache/calcite/sql/validate/implicit/TypeCoercion.html#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 or |
| nested STRING in collection type like ARRAY. Excluding these types, |
| <a href="../../../../../../org/apache/calcite/sql/validate/implicit/TypeCoercion.html#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> |
| </li> |
| </ul> |
| <a name="getWiderTypeForDecimal-org.apache.calcite.rel.type.RelDataType-org.apache.calcite.rel.type.RelDataType-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getWiderTypeForDecimal</h4> |
| <pre><a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> getWiderTypeForDecimal(<a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> type1, |
| <a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> type2)</pre> |
| <div class="block">Finds a wider type when one or both types are DECIMAL type. |
| |
| <p>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 DECIMAL type |
| that 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="../../../../../../org/apache/calcite/rel/type/RelDataTypeSystem.html" title="org.apache.calcite.rel.type中的接口"><code>RelDataTypeSystem</code></a>.</div> |
| </li> |
| </ul> |
| <a name="commonTypeForBinaryComparison-org.apache.calcite.rel.type.RelDataType-org.apache.calcite.rel.type.RelDataType-"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>commonTypeForBinaryComparison</h4> |
| <pre><a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> commonTypeForBinaryComparison(<a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> type1, |
| <a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> type2)</pre> |
| <div class="block">Determines common type for a comparison operator whose operands are STRING |
| type and the other (non STRING) type.</div> |
| </li> |
| </ul> |
| <a name="rowTypeCoercion-org.apache.calcite.sql.validate.SqlValidatorScope-org.apache.calcite.sql.SqlNode-int-org.apache.calcite.rel.type.RelDataType-"> |
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| </a> |
| <ul class="blockList"> |
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| <h4>rowTypeCoercion</h4> |
| <pre>boolean rowTypeCoercion(<a href="../../../../../../org/apache/calcite/sql/validate/SqlValidatorScope.html" title="org.apache.calcite.sql.validate中的接口">SqlValidatorScope</a> scope, |
| <a href="../../../../../../org/apache/calcite/sql/SqlNode.html" title="org.apache.calcite.sql中的类">SqlNode</a> query, |
| int columnIndex, |
| <a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> targetType)</pre> |
| <div class="block">Widen a SqlNode ith column type to target type, mainly used for set |
| operations like UNION, INTERSECT and EXCEPT.</div> |
| <dl> |
| <dt><span class="paramLabel">参数:</span></dt> |
| <dd><code>scope</code> - scope to query</dd> |
| <dd><code>query</code> - SqlNode which have children nodes as columns</dd> |
| <dd><code>columnIndex</code> - target column index</dd> |
| <dd><code>targetType</code> - target type to cast to</dd> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>true if we add any cast in successfully</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="inOperationCoercion-org.apache.calcite.sql.SqlCallBinding-"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>inOperationCoercion</h4> |
| <pre>boolean inOperationCoercion(<a href="../../../../../../org/apache/calcite/sql/SqlCallBinding.html" title="org.apache.calcite.sql中的类">SqlCallBinding</a> binding)</pre> |
| <div class="block">Handles type coercion for IN operation with or without sub-query. |
| |
| <p>See <a href="../../../../../../org/apache/calcite/sql/validate/implicit/TypeCoercionImpl.html" title="org.apache.calcite.sql.validate.implicit中的类"><code>TypeCoercionImpl</code></a> for default strategies.</div> |
| </li> |
| </ul> |
| <a name="binaryArithmeticCoercion-org.apache.calcite.sql.SqlCallBinding-"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>binaryArithmeticCoercion</h4> |
| <pre>boolean binaryArithmeticCoercion(<a href="../../../../../../org/apache/calcite/sql/SqlCallBinding.html" title="org.apache.calcite.sql中的类">SqlCallBinding</a> binding)</pre> |
| <div class="block">Coerce operand of binary arithmetic expressions to Numeric type.</div> |
| </li> |
| </ul> |
| <a name="binaryComparisonCoercion-org.apache.calcite.sql.SqlCallBinding-"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>binaryComparisonCoercion</h4> |
| <pre>boolean binaryComparisonCoercion(<a href="../../../../../../org/apache/calcite/sql/SqlCallBinding.html" title="org.apache.calcite.sql中的类">SqlCallBinding</a> binding)</pre> |
| <div class="block">Coerce operands in binary comparison expressions.</div> |
| </li> |
| </ul> |
| <a name="caseWhenCoercion-org.apache.calcite.sql.SqlCallBinding-"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>caseWhenCoercion</h4> |
| <pre>boolean caseWhenCoercion(<a href="../../../../../../org/apache/calcite/sql/SqlCallBinding.html" title="org.apache.calcite.sql中的类">SqlCallBinding</a> binding)</pre> |
| <div class="block">Coerce CASE WHEN statement branches to one common type. |
| |
| <p>Rules: Find common type for all the then operands and else operands, |
| then try to coerce the then/else operands to the type if needed.</div> |
| </li> |
| </ul> |
| <a name="builtinFunctionCoercion-org.apache.calcite.sql.SqlCallBinding-java.util.List-java.util.List-"> |
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| </a> |
| <ul class="blockList"> |
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| <h4>builtinFunctionCoercion</h4> |
| <pre>boolean builtinFunctionCoercion(<a href="../../../../../../org/apache/calcite/sql/SqlCallBinding.html" title="org.apache.calcite.sql中的类">SqlCallBinding</a> binding, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="java.util中的类或接口">List</a><<a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a>> operandTypes, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="java.util中的类或接口">List</a><<a href="../../../../../../org/apache/calcite/sql/type/SqlTypeFamily.html" title="org.apache.calcite.sql.type中的枚举">SqlTypeFamily</a>> expectedFamilies)</pre> |
| <div class="block">Type coercion with inferred type from passed in arguments and the |
| <a href="../../../../../../org/apache/calcite/sql/type/SqlTypeFamily.html" title="org.apache.calcite.sql.type中的枚举"><code>SqlTypeFamily</code></a> defined in the checkers, e.g. the |
| <a href="../../../../../../org/apache/calcite/sql/type/FamilyOperandTypeChecker.html" title="org.apache.calcite.sql.type中的类"><code>FamilyOperandTypeChecker</code></a>. |
| |
| <p>Caution that we do not cast from NUMERIC if desired type family is also |
| <a href="../../../../../../org/apache/calcite/sql/type/SqlTypeFamily.html#NUMERIC"><code>SqlTypeFamily.NUMERIC</code></a>. |
| |
| <p>If the <a href="../../../../../../org/apache/calcite/sql/type/FamilyOperandTypeChecker.html" title="org.apache.calcite.sql.type中的类"><code>FamilyOperandTypeChecker</code></a>s are |
| subsumed in a |
| <a href="../../../../../../org/apache/calcite/sql/type/CompositeOperandTypeChecker.html" title="org.apache.calcite.sql.type中的类"><code>CompositeOperandTypeChecker</code></a>, check them |
| based on their combination order. i.e. If we allow a NUMERIC_NUMERIC OR |
| STRING_NUMERIC family combination and are with arguments (op1: VARCHAR(20), op2: BOOLEAN), |
| try to coerce both op1 and op2 to NUMERIC if the type coercion rules allow it, |
| or else try to coerce op2 to NUMERIC and keep op1 the type as it is. |
| |
| <p>This is also very interrelated to the composition predicate for the |
| checkers: if the predicate is AND, we would fail fast if the first family |
| type coercion fails.</div> |
| <dl> |
| <dt><span class="paramLabel">参数:</span></dt> |
| <dd><code>binding</code> - Call binding</dd> |
| <dd><code>operandTypes</code> - Types of the operands passed in</dd> |
| <dd><code>expectedFamilies</code> - Expected SqlTypeFamily list by user specified</dd> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>true if we successfully do any implicit cast</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="userDefinedFunctionCoercion-org.apache.calcite.sql.validate.SqlValidatorScope-org.apache.calcite.sql.SqlCall-org.apache.calcite.sql.SqlFunction-"> |
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| <ul class="blockList"> |
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| <h4>userDefinedFunctionCoercion</h4> |
| <pre>boolean userDefinedFunctionCoercion(<a href="../../../../../../org/apache/calcite/sql/validate/SqlValidatorScope.html" title="org.apache.calcite.sql.validate中的接口">SqlValidatorScope</a> scope, |
| <a href="../../../../../../org/apache/calcite/sql/SqlCall.html" title="org.apache.calcite.sql中的类">SqlCall</a> call, |
| <a href="../../../../../../org/apache/calcite/sql/SqlFunction.html" title="org.apache.calcite.sql中的类">SqlFunction</a> function)</pre> |
| <div class="block">Non built-in functions (UDFs) type coercion, compare the types of arguments |
| with rules: |
| |
| <ol> |
| <li>named param: find the desired type by the passed in operand's name |
| <li>non-named param: find the desired type by formal parameter ordinal |
| </ol> |
| |
| <p>Try to make type coercion only of the desired type is found.</div> |
| <dl> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>true if any operands is coerced</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="querySourceCoercion-org.apache.calcite.sql.validate.SqlValidatorScope-org.apache.calcite.rel.type.RelDataType-org.apache.calcite.rel.type.RelDataType-org.apache.calcite.sql.SqlNode-"> |
| <!-- --> |
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| <ul class="blockListLast"> |
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| <h4>querySourceCoercion</h4> |
| <pre>boolean querySourceCoercion(<a href="../../../../../../org/apache/calcite/sql/validate/SqlValidatorScope.html" title="org.apache.calcite.sql.validate中的接口">SqlValidatorScope</a> scope, |
| <a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> sourceRowType, |
| <a href="../../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> targetRowType, |
| <a href="../../../../../../org/apache/calcite/sql/SqlNode.html" title="org.apache.calcite.sql中的类">SqlNode</a> query)</pre> |
| <div class="block">Coerces the source row expression to target type in an INSERT or UPDATE query. |
| |
| <p>If the source and target fields in the same ordinal do not equal sans nullability, |
| try to coerce the source field to target field type.</div> |
| <dl> |
| <dt><span class="paramLabel">参数:</span></dt> |
| <dd><code>scope</code> - Source scope</dd> |
| <dd><code>sourceRowType</code> - Source row type</dd> |
| <dd><code>targetRowType</code> - Target row type</dd> |
| <dd><code>query</code> - The query, either an INSERT or UPDATE</dd> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>True if any type coercion happens</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
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