Method transformFromItem

transpiler/transform/operators.go:330–365

(node *pg_query.Node)

}

func (t *OperatorTransform) transformFromItem(node *pg_query.Node) bool {
	if node == nil {
		return false
	}

	changed := false

	// Handle JoinExpr
	if joinExpr := node.GetJoinExpr(); joinExpr != nil {
		if joinExpr.Quals != nil {
			if newQuals := t.transformExpression(joinExpr.Quals); newQuals != nil {
				joinExpr.Quals = newQuals
				changed = true
			}
		}
		if t.transformFromItem(joinExpr.Larg) {
			changed = true
		}
		if t.transformFromItem(joinExpr.Rarg) {
			changed = true
		}
	}

	// Handle subselects
	if rangeSubselect := node.GetRangeSubselect(); rangeSubselect != nil {
		if rangeSubselect.Subquery != nil {
			if subSelect := rangeSubselect.Subquery.GetSelectStmt(); subSelect != nil {
				if t.transformSelectStmt(subSelect) {
					changed = true
				}
			}
		}
	}

	return changed
}

// transformExpression recursively transforms an expression, replacing regex operators
// with function calls. Returns the new node if transformed, nil otherwise.