Merge pull request #1961 from tarantool/pgulutzan-gh-1650

Fixes gh-1650 Add columns to existing tables in SQL

Author: pgulutzan

doc/reference/reference_sql/alter_table.spec

@@ -6,6 +6,9 @@ stack (
     line(
       ' RENAME ', ' TO ', 'new-table-name'
     ),
+    line(
+      ' ADD ', ' COLUMN ', 'column-name', 'column-definition'
+    ),
     line(
       ' ADD ', ' CONSTRAINT ', 'constraint-name', 'constraint-definition'
     ),