Fix #1616: INSERT INTO with a SELECT * FROM and a subquery throws exception

[ambujsahu81]

What is the PR `for?

• It is an attempt to fix the issue #1616

Description :

• It seems that the statement alasql.exec('SELECT * FROM t2 WHERE val = (SELECT val FROM t3 WHERE id= 2)') work fine without throwing any errors. And the ast object has statement property which contain sql statement itself at index 0. this property contains queries object. Something like this :

SELECT * FROM t2 WHERE val = SELECT val FROM t3 WHERE id = 2
statements: (1) [yy.Select]
      0: SELECT * FROM t2 WHERE val = SELECT val FROM t3 WHERE id = 2
            columns: (1) [Column]
            from:  (1) [Table]
            queries: (1) [yy.Select]    // <-   This property is present here
            where:  val = SELECT val FROM t3 WHERE id = 2

• But for the statement alasql.exec('INSERT INTO t SELECT * FROM t2 WHERE val = (SELECT val FROM t3 WHERE id= 2)') queries property is present in insert object which also contain nested select Object where queries property is missing For example

INSERT INTO t SELECT * FROM t2 WHERE val = SELECT val FROM t3 WH
statements:(1) [yy.Insert]
	0: INSERT INTO t SELECT * FROM t2 WHERE val = SELECT val FROM t3 WH
	     into: t
	    queries: (1) [yy.Select]  // present here
	     select: SELECT * FROM t2 WHERE val = SELECT val FROM t3 WHERE id = 2
		columns:(1) [Column]
		from: (1) [Table]  // missing here
		where: val = SELECT val FROM t3 WHERE id = 2

• To avoid the exception the code changes adds the missing queries property in nested select object

[mathiasrw]

Thank you so much!

[mathiasrw]

Released as part of v2.5.3