1) Improve the handling of the queries like (select ..) union (select ..)

whose first non-space character is '('.
2) Handle Insert .. () VALUES ().

src/interfaces/odbc/convert.c

@@ -1622,6 +1622,34 @@ table_for_update(const char *stmt, int *endpos)
 	return !wstmt[0] || isspace((unsigned char) wstmt[0]);
 }
 
+/*----------
+ *	Check if the statement is
+ *	INSERT INTO ... () VALUES ()
+ *	This isn't really a strict check but ...
+ *----------
+ */
+static BOOL
+insert_without_target(const char *stmt, int *endpos)
+{
+	const char *wstmt = stmt;
+
+	while (isspace((unsigned char) *(++wstmt)));
+	if (!*wstmt)
+		return FALSE;
+	if (strnicmp(wstmt, "VALUES", 6))
+		return FALSE;
+	wstmt += 6;
+	if (!wstmt[0] || !isspace((unsigned char) wstmt[0]))
+		return FALSE;
+	while (isspace((unsigned char) *(++wstmt)));
+	if (*wstmt != '(' || *(++wstmt) != ')')
+		return FALSE;
+	wstmt++;
+	*endpos = wstmt - stmt;
+	return !wstmt[0] || isspace((unsigned char) wstmt[0])
+		|| ';' == wstmt[0];
+}
+
 #ifdef MULTIBYTE
 #define		my_strchr(conn, s1,c1) pg_mbschr(conn->ccsc, s1,c1)
 #else
@@ -1963,7 +1991,7 @@ inner_process_tokens(QueryParse *qp, QueryBuild *qb)
 							qb->npos -= qp->declare_pos;
 						}
 					}
-					if (qp->token_len == 3)
+					else if (qp->token_len == 3)
 					{
 						int			endpos;
 
@@ -1985,6 +2013,20 @@ inner_process_tokens(QueryParse *qp, QueryBuild *qb)
 							}
 						}
 					}
+					else if (qp->token_len == 2)
+					{
+						int	endpos;
+
+						if (STMT_TYPE_INSERT == qp->statement_type &&
+							strnicmp(qp->token_save, "()", 2) == 0 &&
+							insert_without_target(&qp->statement[qp->opos], &endpos))
+						{
+							qb->npos -= 2;
+							CVT_APPEND_STR(qb, "DEFAULT VALUES");
+							qp->opos += endpos;
+							return SQL_SUCCESS;
+						}
+					}
 				}
 			}
 			else if (qp->prev_token_end)

src/interfaces/odbc/parse.c

@@ -873,6 +873,11 @@ parse_statement(StatementClass *stmt)
 
 	mylog("--------------------------------------------\n");
 	mylog("nfld=%d, ntab=%d\n", irdflds->nfields, stmt->ntab);
+	if (0 == stmt->ntab)
+	{
+		stmt->parse_status = STMT_PARSE_FATAL;
+		return	FALSE;
+	}
 
 	for (i = 0; i < (int) irdflds->nfields; i++)
 	{

src/interfaces/odbc/statement.c

@@ -439,7 +439,7 @@ statement_type(char *statement)
 	int			i;
 
 	/* ignore leading whitespace in query string */
-	while (*statement && isspace((unsigned char) *statement))
+	while (*statement && (isspace((unsigned char) *statement) || *statement == '('))
 		statement++;
 
 	for (i = 0; Statement_Type[i].s; i++)