org.apache.spark.sql.catalyst.analysis.resolver
TypeCoercionResolver
Companion object TypeCoercionResolver
class TypeCoercionResolver extends TreeNodeResolver[Expression, Expression]
TypeCoercionResolver is used by other resolvers to uniformly apply type coercions to all expressions.
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- TypeCoercionResolver
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Instance Constructors
- new TypeCoercionResolver(timezoneAwareExpressionResolver: TimezoneAwareExpressionResolver, typeCoercionTransformations: Seq[(Expression) => Expression] = Seq.empty)
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- final def !=(arg0: Any): Boolean
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- def conf: SQLConf
The active config object within the current scope.
The active config object within the current scope. See SQLConf.get for more information.
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- SQLConfHelper
- final def eq(arg0: AnyRef): Boolean
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- def getSummary(sqlContext: QueryContext): String
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- def resolve(expression: Expression): Expression
Resolves type coercion for expression by applying necessary transformations on the expression and its children.
Resolves type coercion for expression by applying necessary transformations on the expression and its children. Because fixed-point sometimes resolves type coercion in multiple passes, we apply each provided transformation twice, cyclically, to ensure that types are resolved. For example in a query like:
SELECT '1' + '1'
fixed-point analyzer requires two passes to resolve types.
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- TypeCoercionResolver → TreeNodeResolver
- final def synchronized[T0](arg0: => T0): T0
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- def toDSOption(option: String): String
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- def toSQLConf(conf: String): String
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- def toSQLConfVal(conf: String): String
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- def toSQLExpr(e: Expression): String
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- def toSQLId(parts: String): String
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- def withSQLConf[T](pairs: (String, String)*)(f: => T): T
Sets all SQL configurations specified in
pairs, callsf, and then restores all SQL configurations.Sets all SQL configurations specified in
pairs, callsf, and then restores all SQL configurations.- Attributes
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- SQLConfHelper
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- Deprecated
(Since version 9)