object Canonicalize
Rewrites an expression using rules that are guaranteed preserve the result while attempting
to remove cosmetic variations. Deterministic expressions that are equal after canonicalization
will always return the same answer given the same input (i.e. false positives should not be
possible). However, it is possible that two canonical expressions that are not equal will in fact
return the same answer given any input (i.e. false negatives are possible).
The following rules are applied:
- Names and nullability hints for org.apache.spark.sql.types.DataTypes are stripped.
- Names for GetStructField are stripped.
- TimeZoneId for Cast and AnsiCast are stripped if
needsTimeZoneis false. - Commutative and associative operations (Add and Multiply) have their children ordered
by
hashCode. - EqualTo and EqualNullSafe are reordered by
hashCode. - Other comparisons (GreaterThan, LessThan) are reversed by
hashCode. - Elements in In are reordered by
hashCode.
Linear Supertypes
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- def execute(e: Expression): Expression
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