Fix :start and :end json accesses on snowflake (apache#1110)

Author: jmhain

src/parser/mod.rs

@@ -5471,7 +5471,14 @@ impl<'a> Parser<'a> {
                     )?,
                 },
                 // Case when Snowflake Semi-structured data like key:value
-                Keyword::NoKeyword | Keyword::LOCATION | Keyword::TYPE | Keyword::DATE if dialect_of!(self is SnowflakeDialect | GenericDialect) => {
+                Keyword::NoKeyword
+                | Keyword::LOCATION
+                | Keyword::TYPE
+                | Keyword::DATE
+                | Keyword::START
+                | Keyword::END
+                    if dialect_of!(self is SnowflakeDialect | GenericDialect) =>
+                {
                     Ok(Value::UnQuotedString(w.value))
                 }
                 _ => self.expected(

tests/sqlparser_snowflake.rs

@@ -229,6 +229,24 @@ fn parse_json_using_colon() {
     );
 
     snowflake().one_statement_parses_to("SELECT a:b::int FROM t", "SELECT CAST(a:b AS INT) FROM t");
+
+    let sql = "SELECT a:start, a:end FROM t";
+    let select = snowflake().verified_only_select(sql);
+    assert_eq!(
+        vec![
+            SelectItem::UnnamedExpr(Expr::JsonAccess {
+                left: Box::new(Expr::Identifier(Ident::new("a"))),
+                operator: JsonOperator::Colon,
+                right: Box::new(Expr::Value(Value::UnQuotedString("start".to_string()))),
+            }),
+            SelectItem::UnnamedExpr(Expr::JsonAccess {
+                left: Box::new(Expr::Identifier(Ident::new("a"))),
+                operator: JsonOperator::Colon,
+                right: Box::new(Expr::Value(Value::UnQuotedString("end".to_string()))),
+            })
+        ],
+        select.projection
+    );
 }
 
 #[test]