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Now rlike is not supported in calcite, i think it's useful to support this so that it can be used in other engine depending on calcite.
Calcite SQLParser: Provide support for RLIKE expressions
Add support for Regular Expression Operators (RLIKE)
Add ILIKE operator (similar to LIKE, but case-insensitive, and PostgreSQL-specific)
Cache compiled regular expressions in SQL function runtime
GitHub Pull Request #2341
GitHub Pull Request #2363