public SQLSelectQuery queryRest(SQLSelectQuery selectQuery) {
if (lexer.token() == Token.UNION) {
lexer.nextToken();
SQLUnionQuery union = createSQLUnionQuery();
union.setLeft(selectQuery);
if (lexer.token() == Token.ALL) {
union.setOperator(SQLUnionOperator.UNION_ALL);
lexer.nextToken();
} else if (lexer.token() == Token.DISTINCT) {
union.setOperator(SQLUnionOperator.DISTINCT);
lexer.nextToken();
}
SQLSelectQuery right = this.query();
union.setRight(right);
return unionRest(union);
}
if (lexer.token() == Token.INTERSECT) {
lexer.nextToken();
SQLUnionQuery union = new SQLUnionQuery();
union.setLeft(selectQuery);
union.setOperator(SQLUnionOperator.INTERSECT);
SQLSelectQuery right = this.query();
union.setRight(right);
return union;
}
if (lexer.token() == Token.MINUS) {
lexer.nextToken();
SQLUnionQuery union = new SQLUnionQuery();
union.setLeft(selectQuery);
union.setOperator(SQLUnionOperator.MINUS);
SQLSelectQuery right = this.query();
union.setRight(right);
return union;
}
return selectQuery;