snowflake/generic: position can be the name of a column (#1022)

Co-authored-by: Lukasz Stefaniak <lustefaniak@gmail.com>

src/parser/mod.rs

@@ -794,7 +794,9 @@ impl<'a> Parser<'a> {
                 Keyword::EXTRACT => self.parse_extract_expr(),
                 Keyword::CEIL => self.parse_ceil_floor_expr(true),
                 Keyword::FLOOR => self.parse_ceil_floor_expr(false),
-                Keyword::POSITION => self.parse_position_expr(),
+                Keyword::POSITION if self.peek_token().token == Token::LParen => {
+                    self.parse_position_expr()
+                }
                 Keyword::SUBSTRING => self.parse_substring_expr(),
                 Keyword::OVERLAY => self.parse_overlay_expr(),
                 Keyword::TRIM => self.parse_trim_expr(),

tests/sqlparser_snowflake.rs

@@ -1067,6 +1067,12 @@ fn test_snowflake_trim() {
     );
 }
 
+#[test]
+fn parse_position_not_function_columns() {
+    snowflake_and_generic()
+        .verified_stmt("SELECT position FROM tbl1 WHERE position NOT IN ('first', 'last')");
+}
+
 #[test]
 fn parse_subquery_function_argument() {
     // Snowflake allows passing an unparenthesized subquery as the single