rluvaton commented on code in PR #20308:
URL: https://github.com/apache/datafusion/pull/20308#discussion_r2824158713
##########
datafusion/functions/src/regex/mod.rs:
##########
@@ -65,6 +67,19 @@ pub mod expr_fn {
super::regexp_match().call(args)
}
+ /// Extracts a group that matches `regexp`. If `idx` is not specified,
+ /// it defaults to 1.
+ ///
+ /// Matches Spark's DataFrame API: `regexp_extract(e: Column, exp: String,
groupIdx: Int)`
Review Comment:
Although I usually agree, it is useful to have a reference implementation
why it was like that, like we do for other functions that match Postgres
behavior
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