feat(embedded/sql): show table stmt

Signed-off-by: Jeronimo Irazabal <[email protected]>

Author: jeroiraz

embedded/sql/sql_grammar.y

@@ -576,6 +576,13 @@ dqlstmt:
             ds: &FnDataSourceStmt{fnCall: &FnCall{fn: "tables"}},
         }
     }
+|
+    SHOW TABLE IDENTIFIER
+    {
+        $$ = &SelectStmt{
+            ds: &FnDataSourceStmt{fnCall: &FnCall{fn: "table", params: []ValueExp{&Varchar{val: $3}}}},
+        }
+    }
 |
     SHOW USERS
     {
@@ -695,6 +702,11 @@ ds:
     {
         $$ = &FnDataSourceStmt{fnCall:  &FnCall{fn: "tables"}, as: $4}
     }
+|
+    TABLE '(' IDENTIFIER ')'
+    {
+        $$ = &FnDataSourceStmt{fnCall:  &FnCall{fn: "table", params: []ValueExp{&Varchar{val: $3}}}}
+    }
 |
     USERS '(' ')' opt_as
     {