Function matchFilter

compiler/optimizer/optimizer.go:444–453

matchFilter attempts to find a filter from the front seq and returns the filter's expression (and the modified seq) so we can lift the filter predicate into the scanner.

(seq dag.Seq)

// and returns the filter's expression (and the modified seq) so
// we can lift the filter predicate into the scanner.
func matchFilter(seq dag.Seq) (dag.Expr, dag.Seq) {
	if len(seq) == 0 {
		return nil, seq
	}
	filter, ok := seq[0].(*dag.FilterOp)
	if !ok {
		return nil, seq
	}
	return filter.Expr, seq[1:]
}

// inlineRecordExprSpreads transforms "{...{a}}" to "{a}".
func inlineRecordExprSpreads(v any) {