From 4c98e8fcb5df2b8fb81a6183598b51696abe6e73 Mon Sep 17 00:00:00 2001
From: Takahiro Ebato <takahiro.ebato@gmail.com>
Date: Sun, 5 Jan 2025 13:43:32 +0900
Subject: [PATCH] fix(sqlparser): make LIMIT and OFFSET order flexible

---
 src/sqlparser/src/parser.rs              | 20 ++++++++++----------
 src/sqlparser/tests/testdata/select.yaml | 22 ++++++++++++++++++++++
 2 files changed, 32 insertions(+), 10 deletions(-)

diff --git a/src/sqlparser/src/parser.rs b/src/sqlparser/src/parser.rs
index e81c06371d617..9eb3d9e439967 100644
--- a/src/sqlparser/src/parser.rs
+++ b/src/sqlparser/src/parser.rs
@@ -4248,17 +4248,17 @@ impl Parser<'_> {
             vec![]
         };
 
-        let limit = if self.parse_keyword(Keyword::LIMIT) {
-            self.parse_limit()?
-        } else {
-            None
-        };
+        let mut limit = None;
+        let mut offset = None;
+        for _x in 0..2 {
+            if limit.is_none() && self.parse_keyword(Keyword::LIMIT) {
+                limit = self.parse_limit()?
+            }
 
-        let offset = if self.parse_keyword(Keyword::OFFSET) {
-            Some(self.parse_offset()?)
-        } else {
-            None
-        };
+            if offset.is_none() && self.parse_keyword(Keyword::OFFSET) {
+                offset = Some(self.parse_offset()?)
+            }
+        }
 
         let fetch = if self.parse_keyword(Keyword::FETCH) {
             if limit.is_some() {
diff --git a/src/sqlparser/tests/testdata/select.yaml b/src/sqlparser/tests/testdata/select.yaml
index 72de88bd1dfb4..78f7c6a001dbd 100644
--- a/src/sqlparser/tests/testdata/select.yaml
+++ b/src/sqlparser/tests/testdata/select.yaml
@@ -237,3 +237,25 @@
     SELECT a0 + b0 FROM a_log, "B_log"
   formatted_sql: WITH a_log AS changelog from a, "B_log" AS changelog from public."B" SELECT a0 + b0 FROM a_log, "B_log"
   formatted_ast: 'Query(Query { with: Some(With { recursive: false, cte_tables: [Cte { alias: TableAlias { name: Ident { value: "a_log", quote_style: None }, columns: [] }, cte_inner: ChangeLog(ObjectName([Ident { value: "a", quote_style: None }])) }, Cte { alias: TableAlias { name: Ident { value: "B_log", quote_style: Some(''"'') }, columns: [] }, cte_inner: ChangeLog(ObjectName([Ident { value: "public", quote_style: None }, Ident { value: "B", quote_style: Some(''"'') }])) }] }), body: Select(Select { distinct: All, projection: [UnnamedExpr(BinaryOp { left: Identifier(Ident { value: "a0", quote_style: None }), op: Plus, right: Identifier(Ident { value: "b0", quote_style: None }) })], from: [TableWithJoins { relation: Table { name: ObjectName([Ident { value: "a_log", quote_style: None }]), alias: None, as_of: None }, joins: [] }, TableWithJoins { relation: Table { name: ObjectName([Ident { value: "B_log", quote_style: Some(''"'') }]), alias: None, as_of: None }, joins: [] }], lateral_views: [], selection: None, group_by: [], having: None }), order_by: [], limit: None, offset: None, fetch: None })'
+- input: SELECT * FROM t LIMIT 1
+  formatted_sql: SELECT * FROM t LIMIT 1
+  formatted_ast: 'Query(Query { with: None, body: Select(Select { distinct: All, projection: [Wildcard(None)], from: [TableWithJoins { relation: Table { name: ObjectName([Ident { value: "t", quote_style: None }]), alias: None, as_of: None }, joins: [] }], lateral_views: [], selection: None, group_by: [], having: None }), order_by: [], limit: Some(Value(Number("1"))), offset: None, fetch: None })'
+- input: SELECT * FROM t OFFSET 1
+  formatted_sql: SELECT * FROM t OFFSET 1
+  formatted_ast: 'Query(Query { with: None, body: Select(Select { distinct: All, projection: [Wildcard(None)], from: [TableWithJoins { relation: Table { name: ObjectName([Ident { value: "t", quote_style: None }]), alias: None, as_of: None }, joins: [] }], lateral_views: [], selection: None, group_by: [], having: None }), order_by: [], limit: None, offset: Some("1"), fetch: None })'
+- input: SELECT * FROM t LIMIT 1 OFFSET 2
+  formatted_sql: SELECT * FROM t LIMIT 1 OFFSET 2
+  formatted_ast: 'Query(Query { with: None, body: Select(Select { distinct: All, projection: [Wildcard(None)], from: [TableWithJoins { relation: Table { name: ObjectName([Ident { value: "t", quote_style: None }]), alias: None, as_of: None }, joins: [] }], lateral_views: [], selection: None, group_by: [], having: None }), order_by: [], limit: Some(Value(Number("1"))), offset: Some("2"), fetch: None })'
+- input: SELECT * FROM t OFFSET 2 LIMIT 1
+  formatted_sql: SELECT * FROM t LIMIT 1 OFFSET 2
+  formatted_ast: 'Query(Query { with: None, body: Select(Select { distinct: All, projection: [Wildcard(None)], from: [TableWithJoins { relation: Table { name: ObjectName([Ident { value: "t", quote_style: None }]), alias: None, as_of: None }, joins: [] }], lateral_views: [], selection: None, group_by: [], having: None }), order_by: [], limit: Some(Value(Number("1"))), offset: Some("2"), fetch: None })'
+- input: SELECT * FROM t LIMIT 1 LIMIT 2
+  error_msg: |-
+    sql parser error: expected end of statement, found: LIMIT
+    LINE 1: SELECT * FROM t LIMIT 1 LIMIT 2
+                                    ^
+- input: SELECT * FROM t OFFSET 1 OFFSET 2
+  error_msg: |-
+    sql parser error: expected end of statement, found: OFFSET
+    LINE 1: SELECT * FROM t OFFSET 1 OFFSET 2
+                                     ^