Also support ALL AS for BigQuery

This does, similar to regular `ALL`, not store that state on the
`Select` struct so it's not tested as a `verified_stmt`.

Author: bombsimon

src/parser/mod.rs

@@ -11514,7 +11514,9 @@ impl<'a> Parser<'a> {
                 } else {
                     self.expected("VALUE or STRUCT", self.peek_token())?
                 }
-            } else if self.parse_keyword(Keyword::AS) {
+            } else if self.parse_keyword(Keyword::AS)
+                || self.parse_keywords(&[Keyword::ALL, Keyword::AS])
+            {
                 if self.parse_keyword(Keyword::VALUE) {
                     Some(ValueTableMode::AsValue)
                 } else if self.parse_keyword(Keyword::STRUCT) {

tests/sqlparser_bigquery.rs

@@ -2379,12 +2379,19 @@ fn test_any_type_dont_break_custom_type() {
 }
 
 #[test]
-fn test_select_distinct_as_struct_or_value() {
+fn test_select_distinct_or_all_as_struct_or_value() {
     for sql in [
         "SELECT DISTINCT AS STRUCT a, ABS(b) FROM UNNEST(c) AS T",
         "SELECT DISTINCT AS VALUE a, ABS(b) FROM UNNEST(c) AS T",
         "SELECT ARRAY(SELECT DISTINCT AS STRUCT a, b, ABS(c) AS c, ABS(d) AS d FROM UNNEST(e) AS T)",
     ] {
         bigquery().verified_stmt(sql);
     }
+
+    for sql in [
+        "SELECT ALL AS STRUCT a, ABS(b) FROM UNNEST(c) AS T",
+        "SELECT ALL AS VALUE a, ABS(b) FROM UNNEST(c) AS T",
+    ] {
+        assert!(bigquery().parse_sql_statements(sql).is_ok());
+    }
 }