From: Kirill Shcherbatov <kshcherbatov@tarantool.org> To: tarantool-patches@freelists.org, korablev@tarantool.org Cc: Kirill Shcherbatov <kshcherbatov@tarantool.org> Subject: [tarantool-patches] [PATCH v2 4/8] sql: get rid of SQL_FUNC_COUNT flag Date: Thu, 8 Aug 2019 17:50:48 +0300 [thread overview] Message-ID: <2f18c9df1d818a222f2fb3005d13bd59228d4698.1565275469.git.kshcherbatov@tarantool.org> (raw) In-Reply-To: <cover.1565275469.git.kshcherbatov@tarantool.org> Tarantool's SQL engine generates a different VDBE bytecode for ..COUNT(*).. and ..COUNT(fieldname).. operations: the first one produces a lightweight OP_Count operation that uses native mechanism to report the count of record in index while the second one pessimistically opens a space read iterator and uses Count aggregate function. A helper routine is_simple_count decides whether such optimisation is correct. Using SQL_FUNC_COUNT flag to mark a dummy (non-functional) function entry with 0 arguments is a bad practice and should be reworked in relation with introducing a uniform functions cache in further patches. Therefore SQL_FUNC_COUNT flag test in is_simple_count helper was replaced with more straightforward test with manually looking for count of function arguments passed. Needed for #2200, #4113, #2233 --- src/box/sql/sqlInt.h | 1 - src/box/sql/func.c | 4 ++-- src/box/sql/select.c | 3 ++- 3 files changed, 4 insertions(+), 4 deletions(-) diff --git a/src/box/sql/sqlInt.h b/src/box/sql/sqlInt.h index 4adb30c5c..941c87420 100644 --- a/src/box/sql/sqlInt.h +++ b/src/box/sql/sqlInt.h @@ -1312,7 +1312,6 @@ struct FuncDestructor { */ #define SQL_FUNC_LENGTH 0x0040 /* Built-in length() function */ #define SQL_FUNC_TYPEOF 0x0080 /* Built-in typeof() function */ -#define SQL_FUNC_COUNT 0x0100 /* Built-in count(*) aggregate */ #define SQL_FUNC_COALESCE 0x0200 /* Built-in coalesce() or ifnull() */ #define SQL_FUNC_UNLIKELY 0x0400 /* Built-in unlikely() function */ #define SQL_FUNC_CONSTANT 0x0800 /* Constant inputs give a constant output */ diff --git a/src/box/sql/func.c b/src/box/sql/func.c index f9c0a819e..e011fd958 100644 --- a/src/box/sql/func.c +++ b/src/box/sql/func.c @@ -1910,8 +1910,8 @@ sqlRegisterBuiltinFunctions(void) FIELD_TYPE_NUMBER), AGGREGATE(avg, 1, 0, 0, sum_step, avgFinalize, FIELD_TYPE_NUMBER), - AGGREGATE2(count, 0, 0, 0, countStep, countFinalize, - SQL_FUNC_COUNT, FIELD_TYPE_INTEGER), + AGGREGATE(count, 0, 0, 0, countStep, countFinalize, + FIELD_TYPE_INTEGER), AGGREGATE(count, 1, 0, 0, countStep, countFinalize, FIELD_TYPE_INTEGER), AGGREGATE(group_concat, 1, 0, 0, groupConcatStep, diff --git a/src/box/sql/select.c b/src/box/sql/select.c index c31076694..921a52150 100644 --- a/src/box/sql/select.c +++ b/src/box/sql/select.c @@ -4381,7 +4381,8 @@ is_simple_count(struct Select *select, struct AggInfo *agg_info) return NULL; if (NEVER(agg_info->nFunc == 0)) return NULL; - if ((agg_info->aFunc[0].pFunc->funcFlags & SQL_FUNC_COUNT) == 0) + if (agg_info->aFunc->pExpr->x.pList != NULL && + agg_info->aFunc->pExpr->x.pList->nExpr > 0) return NULL; if (expr->flags & EP_Distinct) return NULL; -- 2.22.0
next prev parent reply other threads:[~2019-08-08 14:50 UTC|newest] Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-08-08 14:50 [tarantool-patches] [PATCH v2 0/8] sql: uniform SQL and Lua functions subsystem Kirill Shcherbatov 2019-08-08 14:50 ` [tarantool-patches] [PATCH v2 1/8] sql: remove SQL_PreferBuiltin flag Kirill Shcherbatov 2019-08-09 16:07 ` [tarantool-patches] " n.pettik 2019-08-12 21:58 ` Konstantin Osipov 2019-08-08 14:50 ` [tarantool-patches] [PATCH v2 2/8] sql: GREATEST, LEAST instead of MIN/MAX overload Kirill Shcherbatov 2019-08-09 17:37 ` [tarantool-patches] " n.pettik 2019-08-13 8:26 ` Kirill Shcherbatov 2019-08-12 21:59 ` Konstantin Osipov 2019-08-08 14:50 ` [tarantool-patches] [PATCH v2 3/8] sql: wrap all trim functions in dispatcher Kirill Shcherbatov 2019-08-09 18:05 ` [tarantool-patches] " n.pettik 2019-08-13 8:28 ` Kirill Shcherbatov 2019-08-13 22:19 ` n.pettik 2019-08-12 22:00 ` Konstantin Osipov 2019-08-08 14:50 ` Kirill Shcherbatov [this message] 2019-08-12 22:01 ` [tarantool-patches] Re: [PATCH v2 4/8] sql: get rid of SQL_FUNC_COUNT flag Konstantin Osipov 2019-08-13 20:35 ` n.pettik 2019-08-14 7:25 ` Kirill Shcherbatov 2019-08-08 14:50 ` [tarantool-patches] [PATCH v2 5/8] sql: introduce a signature_mask for functions Kirill Shcherbatov 2019-08-12 22:04 ` [tarantool-patches] " Konstantin Osipov 2019-08-13 8:32 ` Kirill Shcherbatov 2019-08-13 8:44 ` Konstantin Osipov 2019-08-13 20:38 ` n.pettik 2019-08-14 7:21 ` Kirill Shcherbatov 2019-08-08 14:50 ` [tarantool-patches] [PATCH v2 6/8] sql: rename OP_Function to OP_BuiltinFunction Kirill Shcherbatov 2019-08-12 22:04 ` [tarantool-patches] " Konstantin Osipov 2019-08-13 20:36 ` n.pettik 2019-08-08 14:50 ` [tarantool-patches] [PATCH v2 7/8] sql: get rid of FuncDef function hash Kirill Shcherbatov 2019-08-12 22:11 ` [tarantool-patches] " Konstantin Osipov 2019-08-13 7:29 ` Kirill Shcherbatov 2019-08-13 8:42 ` Konstantin Osipov 2019-08-13 9:45 ` Kirill Shcherbatov 2019-08-13 20:40 ` n.pettik 2019-08-16 12:57 ` Kirill Shcherbatov 2019-08-20 16:06 ` n.pettik 2019-08-08 14:50 ` [tarantool-patches] [PATCH v2 8/8] box: get rid of box.internal.sql_function_create Kirill Shcherbatov 2019-08-13 20:43 ` [tarantool-patches] " n.pettik 2019-08-16 12:57 ` Kirill Shcherbatov 2019-08-20 19:36 ` n.pettik
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