table() doesn't save alias when table is defined as Expression about dsql

[romaninsh]

This has been the limitation with original DSQL too. If you FROM another query/expression you can only have one source.

I am not sure if SQL vendors are happy about having multiple dynamic data sources and joining them together, but if it's a working case, we can implement multi-expression source support through PR.

[DarkSide666]

That's why I proposed to always save tables in $this->args['table'][$table_alias] = $table structured array.

[romaninsh]

I agree, but it's low priority for us. It will not impact the interface either, so we can implement this later.

Also if table() uses expression without alias, it's still a valid format, in which case we could probably use ['table'][0]

[DarkSide666]

yes it's valid format while you have only one table, but can lead to strange and hard to track SQL issues.

I'm ready to implement this sometime soon, just don't close this issue ;)

[DarkSide666]

MySQL will throw exception if we use sub-query as table without alias:
SQLSTATE[42000]: Syntax error or access violation: 1248 Every derived table must have its own alias

[DarkSide666]

Fixed here: #64

[DarkSide666]

implemented here: 1a29ef2