org.apache.spark.sql.catalyst.analysis.resolver
TimezoneAwareExpressionResolver
Companion object TimezoneAwareExpressionResolver
class TimezoneAwareExpressionResolver extends TreeNodeResolver[TimeZoneAwareExpression, Expression] with ResolvesExpressionChildren with CoercesExpressionTypes
Resolves TimeZoneAwareExpressions by applying the session's local timezone.
This class is responsible for resolving TimeZoneAwareExpressions by first resolving their children and then applying the session's local timezone. Additionally, ensures that any tags from the original expression are preserved during the resolution process.
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- TimezoneAwareExpressionResolver
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Instance Constructors
- new TimezoneAwareExpressionResolver(expressionResolver: ExpressionResolver)
Creates a new TimezoneAwareExpressionResolver with the given expression resolver.
Creates a new TimezoneAwareExpressionResolver with the given expression resolver.
- expressionResolver
The ExpressionResolver used to resolve child expressions.
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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.
- Definition Classes
- CoercesExpressionTypes
- 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 resolve(unresolvedTimezoneExpression: TimeZoneAwareExpression): Expression
Resolves a TimeZoneAwareExpression by resolving its children, applying a timezone and calling coerceExpressionTypes on the result.
Resolves a TimeZoneAwareExpression by resolving its children, applying a timezone and calling coerceExpressionTypes on the result. If the expression is a Cast, we apply collapseCast to the result.
- unresolvedTimezoneExpression
The TimeZoneAwareExpression to resolve.
- returns
A resolved Expression with the session's local timezone applied, and optionally type coerced.
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- TimezoneAwareExpressionResolver → 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 toSQLExpr(e: Expression): String
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- def withResolvedChildren(unresolvedExpression: Expression, resolveChild: (Expression) => Expression): Expression
Resolves generic Expression children and returns its copy with children resolved.
Resolves generic Expression children and returns its copy with children resolved.
We avoid extra method calls here, because
resolveChildusually recurses deeply into resolution, and expression trees may be quite deep.- Attributes
- protected
- Definition Classes
- ResolvesExpressionChildren
- def withResolvedChildren(unresolvedExpression: QuaternaryExpression, resolveChild: (Expression) => Expression): Expression
Resolves QuaternaryExpression children and returns its copy with children resolved.
Resolves QuaternaryExpression children and returns its copy with children resolved.
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- protected
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- ResolvesExpressionChildren
- def withResolvedChildren(unresolvedExpression: TernaryExpression, resolveChild: (Expression) => Expression): Expression
Resolves TernaryExpression children and returns its copy with children resolved.
Resolves TernaryExpression children and returns its copy with children resolved.
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- protected
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- ResolvesExpressionChildren
- def withResolvedChildren(unresolvedExpression: BinaryExpression, resolveChild: (Expression) => Expression): Expression
Resolves BinaryExpression children and returns its copy with children resolved.
Resolves BinaryExpression children and returns its copy with children resolved.
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- protected
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- ResolvesExpressionChildren
- def withResolvedChildren(unresolvedExpression: UnaryExpression, resolveChild: (Expression) => Expression): Expression
Resolves UnaryExpression children and returns its copy with children resolved.
Resolves UnaryExpression children and returns its copy with children resolved.
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- protected
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- ResolvesExpressionChildren
- 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)