[Tarantool-patches] [PATCH v3 00/15] sql: refactor aggregate functions

[Mergen Imeev via Tarantool-patches <tarantool-patches@dev.tarantool.org>]

This patch-set refactor the aggregate functions and does some refactoring of the
SQL function infrastructure as a whole.

https://github.com/tarantool/tarantool/issues/4145
https://github.com/tarantool/tarantool/tree/imeevma/gh-4145-aggregate-functions

Changes in v2:
 - Added commit to remove possible UB in int-to-double implicit cast function.
 - Added commit to drop argv from struct sql_context.
 - Review fixes.

Changes in v3:
 - All functional changes were carried over from this patch-set. All that's left
   is refactoring.

Mergen Imeev (15):
  sql: fix possible undefined behavior during cast
  sql: use register P1 for number of arguments
  sql: remove AggStep0 and OP_BuiltinFunction0
  sql: move collation to struct sql_context
  sql: introduce mem_append()
  sql: remove sql_vdbemem_finalize()
  sql: refactor SUM() function
  sql: refactor TOTAL() function
  sql: refactor AVG() function
  sql: refactor COUNT() function
  sql: refactor MIN() and MAX() functions
  sql: refactor GROUP_CONCAT() function
  sql: remove copying of result in finalizers
  sql: remove MEM_TYPE_AGG
  sql: remove field argv from struct sql_context

 src/box/sql/date.c         |  43 --
 src/box/sql/expr.c         |  19 +-
 src/box/sql/func.c         | 815 +++++++++++++++++--------------------
 src/box/sql/main.c         |   5 +-
 src/box/sql/mem.c          |  81 ++--
 src/box/sql/mem.h          |  29 +-
 src/box/sql/select.c       |  35 +-
 src/box/sql/sqlInt.h       |  26 +-
 src/box/sql/vdbe.c         | 192 ++-------
 src/box/sql/vdbeInt.h      |   7 +-
 src/box/sql/vdbeapi.c      |  66 ---
 src/box/sql/vdbeaux.c      |  21 +-
 test/sql-tap/func.test.lua |  15 +-
 13 files changed, 506 insertions(+), 848 deletions(-)

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2.25.1