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cleanup: Item_func_case

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reorder items in args[] array. Instead of

  when1,then1,when2,then2,...[,case][,else]

sort them as

  [case,]when1,when2,...,then1,then2,...[,else]

in this case all items used for comparison take a continuous part
of the array and can be aggregated directly. and all items that
can be returned take a continuous part of the array and can be
aggregated directly. Old code had to copy them to a temporary
array before aggreation, and then copy back (thd->change_item_tree)
everything that was changed.

this is a 10.3 version of bf1ca14ff3
This commit is contained in:
Sergei Golubchik
2018-03-28 20:16:13 +02:00
parent 4c77ef36c6
commit 7a903784b7
3 changed files with 126 additions and 175 deletions
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8
mysql-test/main/func_debug.result
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@ -1630,7 +1630,7 @@ c
NULL
Warnings:
Note 1105 DBUG: [0] arg=1 handler=0 (bigint)
Note 1105 DBUG: [1] arg=3 handler=1 (decimal)
Note 1105 DBUG: [1] arg=2 handler=1 (decimal)
DROP TABLE t1;
#
# MDEV-11555 CASE with a mixture of TIME and DATETIME returns a wrong result
@ -1649,9 +1649,9 @@ good was_bad_now_good
one one
Warnings:
Note 1105 DBUG: [0] arg=1 handler=0 (time)
Note 1105 DBUG: [1] arg=3 handler=0 (time)
Note 1105 DBUG: [1] arg=2 handler=0 (time)
Note 1105 DBUG: [0] arg=1 handler=0 (time)
Note 1105 DBUG: [1] arg=3 handler=0 (time)
Note 1105 DBUG: [2] arg=5 handler=2 (datetime)
Note 1105 DBUG: [1] arg=2 handler=0 (time)
Note 1105 DBUG: [2] arg=3 handler=2 (datetime)
SET SESSION debug_dbug="-d,Predicant_to_list_comparator";
SET SESSION debug_dbug="-d,Item_func_in";