sql: Pretty Printing of Tuples does not match postgres

[BramGruneir]

We do not pretty print tuples the same way that postgres does.

Postgres:

SELECT (1, 2, 'hello', NULL, NULL), (true, NULL, (false, 6.6, false));
      row      |       row
---------------+------------------
 (1,2,hello,,) | (t,,"(f,6.6,f)")

Cockroach:

SELECT (1, 2, 'hello', NULL, NULL), (true, NULL, (false, 6.6, false));
+-----------------------------+--------------------------------+
| (1, 2, 'hello', NULL, NULL) |   (true, NULL, (false, 6.6,    |
|                             |            false))             |
+-----------------------------+--------------------------------+
| (1,2,'hello',,)             | (true,,(false, 6.6, false))    |
+-----------------------------+--------------------------------+

[BramGruneir]

@justinj I was told you fixed arrays for a similar issue.

[jordanlewis]

See the FmtArrays and fmtWithinArray format flags.