feat: add standard sql table type, update scalar type enums

Committer: @shollyman
PiperOrigin-RevId: 385164907

google/cloud/bigquery/v2/standard_sql.proto

@@ -1,4 +1,4 @@
-// Copyright 2020 Google LLC
+// Copyright 2021 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -66,6 +66,9 @@ message StandardSqlDataType {
     // Encoded as RFC 3339 full-date "T" partial-time: 1985-04-12T23:20:50.52
     DATETIME = 21;
 
+    // Encoded as fully qualified 3 part: 0-5 15 2:30:45.6
+    INTERVAL = 26;
+
     // Encoded as WKT
     GEOGRAPHY = 22;
 
@@ -75,6 +78,9 @@ message StandardSqlDataType {
     // Encoded as a decimal string.
     BIGNUMERIC = 24;
 
+    // Encoded as a string.
+    JSON = 25;
+
     // Encoded as a list with types matching Type.array_type.
     ARRAY = 16;
 
@@ -110,3 +116,9 @@ message StandardSqlField {
 message StandardSqlStructType {
   repeated StandardSqlField fields = 1;
 }
+
+// A table type
+message StandardSqlTableType {
+  // The columns in this table type
+  repeated StandardSqlField columns = 1;
+}