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PostgreSQL compatibility: regexp_like should honor PostgreSQL multiline flag m #22268

@Dandandan

Description

@Dandandan

Split out from #22247.

Mismatch

regexp_like should honor PostgreSQL multiline flag m.

SELECT regexp_like(E'a\nb', '^b', 'm');

PostgreSQL:

true

DataFusion:

false

Expected behavior

For PostgreSQL-compatible SQL semantics, DataFusion should either match PostgreSQL's result or raise the same class of domain/semantic error.

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