From 2db9c50440566ed357eecb6942af3ce89821ad70 Mon Sep 17 00:00:00 2001
From: Aleksey Myasnikov <asmyasnikov@ydb.tech>
Date: Mon, 19 Jan 2026 19:09:36 +0300
Subject: [PATCH] refactor(ast): Removed redundant type ast.Const (no parsers
 which produce instance of this type)

---
 internal/sql/ast/const.go        | 17 -----------------
 internal/sql/astutils/rewrite.go |  3 ---
 internal/sql/astutils/walk.go    |  5 -----
 3 files changed, 25 deletions(-)
 delete mode 100644 internal/sql/ast/const.go

diff --git a/internal/sql/ast/const.go b/internal/sql/ast/const.go
deleted file mode 100644
index d33f0e84ed..0000000000
--- a/internal/sql/ast/const.go
+++ /dev/null
@@ -1,17 +0,0 @@
-package ast
-
-type Const struct {
-	Xpr         Node
-	Consttype   Oid
-	Consttypmod int32
-	Constcollid Oid
-	Constlen    int
-	Constvalue  Datum
-	Constisnull bool
-	Constbyval  bool
-	Location    int
-}
-
-func (n *Const) Pos() int {
-	return n.Location
-}
diff --git a/internal/sql/astutils/rewrite.go b/internal/sql/astutils/rewrite.go
index fc7996b5f5..bb3010b560 100644
--- a/internal/sql/astutils/rewrite.go
+++ b/internal/sql/astutils/rewrite.go
@@ -496,9 +496,6 @@ func (a *application) apply(parent ast.Node, name string, iter *iterator, n ast.
 	case *ast.CompositeTypeStmt:
 		a.apply(n, "TypeName", nil, n.TypeName)
 
-	case *ast.Const:
-		a.apply(n, "Xpr", nil, n.Xpr)
-
 	case *ast.Constraint:
 		a.apply(n, "RawExpr", nil, n.RawExpr)
 		a.apply(n, "Keys", nil, n.Keys)
diff --git a/internal/sql/astutils/walk.go b/internal/sql/astutils/walk.go
index 6d5e80bdc3..f208e6631d 100644
--- a/internal/sql/astutils/walk.go
+++ b/internal/sql/astutils/walk.go
@@ -665,11 +665,6 @@ func Walk(f Visitor, node ast.Node) {
 			Walk(f, n.Ctecolcollations)
 		}
 
-	case *ast.Const:
-		if n.Xpr != nil {
-			Walk(f, n.Xpr)
-		}
-
 	case *ast.Constraint:
 		if n.RawExpr != nil {
 			Walk(f, n.RawExpr)