waynexia commented on code in PR #15299:
URL: https://github.com/apache/datafusion/pull/15299#discussion_r2004397798
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datafusion/optimizer/src/simplify_expressions/regex.rs:
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@@ -43,6 +47,23 @@ pub fn simplify_regex_expr(
let mode = OperatorMode::new(&op);
if let Expr::Literal(ScalarValue::Utf8(Some(pattern))) = right.as_ref() {
+ // Handle the special case for ".*" pattern
+ if pattern == ANY_CHAR_REGEX_PATTERN {
+ let new_expr = if mode.not {
+ // not empty
+ let empty_lit = Box::new(lit(""));
+ Expr::BinaryExpr(BinaryExpr {
+ left,
+ op: Operator::Eq,
+ right: empty_lit,
+ })
+ } else {
+ // always true
Review Comment:
Good catch! I added two cases about null in `simplify_expr.slt`, it should
work as expected now.
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