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org.apache.spark.sql.catalyst.analysis.resolver

DefaultCollationTypeCoercion

object DefaultCollationTypeCoercion

This type coercion object is only used in the single-pass analyzer and is not part of the TypeCoercion rules used in the fixed-point analyzer.

When the database object (e.g. View) has a custom default collation and a resolving expression's dataType is the companion object StringType, we need to treat the dataType as a collated StringType. To do this, we wrap the expression with a cast to a StringType with the default collation or change the dataType to StringType with the default collation. Note that when the dataType is equal to the companion object StringType, but isn't the same by reference, we shouldn't change the dataType, since that means the user explicitly specified UTF8_BINARY collation.

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  1. final def !=(arg0: Any): Boolean
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  2. final def ##: Int
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  3. final def ==(arg0: Any): Boolean
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  4. def apply(expression: Expression, collation: String): Expression

    Apply View's default collation to the expression.

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  1. def finalize(): Unit
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    Deprecated

    (Since version 9)

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