beliefer opened a new pull request #27007: [SPARK-28325][SQL]Support ANSI SQL: SIMILAR TO ... ESCAPE syntax URL: https://github.com/apache/spark/pull/27007 ### What changes were proposed in this pull request? [ NOT ] SIMILAR TO <similar pattern> [ ESCAPE <escape character> ] This is a ANSI SQL. For example: ``` SELECT 'abc' SIMILAR TO 'abc' AS `true`; SELECT 'abc' SIMILAR TO 'a' AS `false`; SELECT 'abc' SIMILAR TO '%(b|d)%' AS `true`; SELECT 'abc' SIMILAR TO '(b|c)%' AS `false`; ``` There are some mainstream database support the syntax. **PostgreSQL:** https://www.postgresql.org/docs/current/functions-matching.html#FUNCTIONS-SIMILARTO-REGEXP **Redshift:** https://docs.aws.amazon.com/redshift/latest/dg/pattern-matching-conditions-similar-to.html ### Why are the changes needed? No ### Does this PR introduce any user-facing change? No ### How was this patch tested? new UT.
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