Package org.apache.calcite.sql.fun
Class SqlCoalesceFunction
- java.lang.Object
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- org.apache.calcite.sql.SqlOperator
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- org.apache.calcite.sql.SqlFunction
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- org.apache.calcite.sql.fun.SqlCoalesceFunction
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public class SqlCoalesceFunction extends SqlFunction
TheCOALESCE
function.
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Field Summary
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Fields inherited from class org.apache.calcite.sql.SqlOperator
kind, MDX_PRECEDENCE, NL
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Constructor Summary
Constructors Constructor Description SqlCoalesceFunction()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description SqlNode
rewriteCall(SqlValidator validator, SqlCall call)
Rewrites a call to this operator.-
Methods inherited from class org.apache.calcite.sql.SqlFunction
deriveType, getFunctionType, getNameAsId, getParamNames, getParamTypes, getSqlIdentifier, getSyntax, isQuantifierAllowed, unparse, validateCall, validateQuantifier
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Methods inherited from class org.apache.calcite.sql.SqlOperator
acceptCall, acceptCall, adjustType, allowsFraming, argumentMustBeScalar, checkOperandCount, checkOperandTypes, constructArgNameList, constructArgTypeList, constructOperandList, createCall, createCall, createCall, createCall, equals, getAllowedSignatures, getAllowedSignatures, getKind, getLeftPrec, getMonotonicity, getMonotonicity, getName, getOperandCountRange, getOperandTypeChecker, getOperandTypeInference, getReturnTypeInference, getRightPrec, getSignatureTemplate, hashCode, inferReturnType, inferReturnType, isAggregator, isDeterministic, isDynamicFunction, isGroup, isGroupAuxiliary, isName, leftPrec, preValidateCall, requiresDecimalExpansion, requiresOrder, requiresOver, rightPrec, toString, unparseListClause, unparseListClause, validateOperands, validRexOperands
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Method Detail
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rewriteCall
public SqlNode rewriteCall(SqlValidator validator, SqlCall call)
Description copied from class:SqlOperator
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.- Overrides:
rewriteCall
in classSqlOperator
- Parameters:
validator
- Validatorcall
- Call to be rewritten- Returns:
- rewritten call
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