org.apache.spark.sql.catalyst.analysis.resolver
CoercesExpressionTypes
Companion object CoercesExpressionTypes
trait CoercesExpressionTypes extends SQLConfHelper
CoercesExpressionTypes is extended by resolvers that need to apply type coercion.
ansiTransformations and nonAnsiTransformations may be overridden with custom transformation
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- def coerceExpressionTypes(expression: Expression, expressionTreeTraversal: ExpressionTreeTraversal): Expression
Coerces the expression types by applying necessary transformations on the expression and its children.
Coerces the expression types 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.
In the end, we apply DefaultCollationTypeCoercion. See DefaultCollationTypeCoercion doc for more info.
Additionally, we copy the tags and origin in case the call to this method didn't come from ExpressionResolver, where they are copied generically.
- 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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- def withSQLConf[T](pairs: (String, String)*)(f: => T): T
Sets all SQL configurations specified in
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- Deprecated
(Since version 9)