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Description

Now we have some outer table function like explode_bitmap, and some non-outer function like explode.
I try to make all table functions behave as non-outer, and support outer combinator to automaticly build outer version.
example:

MySQL [test]> select e1 from (select 1 k1) as t lateral view explode_numbers(0) tmp1 as e1;
Empty set (0.009 sec)

MySQL [test]> select e1 from (select 1 k1) as t lateral view explode_numbers_outer(0) tmp1 as e1; 
+------+
| e1   |
+------+
| NULL |
+------+

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• Yes I am willing to submit a PR!

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