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lower_pattern

risingwave_frontend::optimizer::plan_node::stream_match_recognize

Function lower_pattern 

Source 
fn lower_pattern(
    pattern: &MatchRecognizePattern,
) -> Result<MatchRecognizePatternNode>
Expand description

Lower a bound MatchRecognizePattern (the sqlparser AST) into the structured pattern proto consumed by the executor. Parenthesized groups are flattened (the executor pattern has no group node); anchors (^, $) and exclusions ({- ... -}) are rejected here as they are not yet supported. This replaces the previous text round-trip (Display ↔ a hand-rolled parser).