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Fri, 01 Oct 2021 15:48:50 +0300 To: v.shpilevoy@tarantool.org Cc: tarantool-patches@dev.tarantool.org Date: Fri, 1 Oct 2021 15:48:50 +0300 Message-Id: <3543f4417e240c74d1dea9a2b6e086aeca950167.1633092363.git.imeevma@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit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eAau8CL7WIMRKs4sN3D3tLDjz0dLbV79QFUyzQ2Ujvy7cMT6pYYqY16iZVKkSc3dCLJ7zSJH7+u4VD18S7Vl4ZUrpaVfd2+vE6kuoey4m4VkSEu530nj6fImhcD4MUrOEAnl0W826KZ9Q+tr5ycPtXkTV4k65bRjmOUUP8cvGozZ33TWg5HZplvhhXbhDGzqmQDTd6OAevLeAnq3Ra9uf7zvY2zzsIhlcp/Y7m53TZgf2aB4JOg4gkr2biojJNmX3owDPmGpCrB6JTMFfQ== X-Mailru-Sender: 689FA8AB762F7393C37E3C1AEC41BA5D4DE5ECC7771F91D5DF1EBA672EFB928383D72C36FC87018B9F80AB2734326CD2FB559BB5D741EB96352A0ABBE4FDA4210A04DAD6CC59E33667EA787935ED9F1B X-Mras: Ok Subject: [Tarantool-patches] [PATCH v4 10/16] sql: refactor AVG() function X-BeenThere: tarantool-patches@dev.tarantool.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Tarantool development patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Mergen Imeev via Tarantool-patches Reply-To: imeevma@tarantool.org Errors-To: tarantool-patches-bounces@dev.tarantool.org Sender: "Tarantool-patches" Part of #4145 --- src/box/sql/func.c | 119 ++++++++++++++++++++------------------------- 1 file changed, 54 insertions(+), 65 deletions(-) diff --git a/src/box/sql/func.c b/src/box/sql/func.c index 8a9de1254..94ec811ef 100644 --- a/src/box/sql/func.c +++ b/src/box/sql/func.c @@ -102,6 +102,58 @@ fin_total(struct sql_context *ctx) mem_copy_as_ephemeral(ctx->pOut, ctx->pMem); } +/** Implementation of the AVG() function. */ +static void +step_avg(struct sql_context *ctx, int argc, struct Mem **argv) +{ + assert(argc == 1); + (void)argc; + assert(mem_is_null(ctx->pMem) || mem_is_bin(ctx->pMem)); + if (mem_is_null(argv[0])) + return; + struct Mem *mem; + uint32_t *count; + if (mem_is_null(ctx->pMem)) { + uint32_t size = sizeof(struct Mem) + sizeof(uint32_t); + mem = sqlDbMallocRawNN(sql_get(), size); + if (mem == NULL) { + ctx->is_aborted = true; + return; + } + count = (uint32_t *)(mem + 1); + mem_create(mem); + *count = 1; + mem_copy_as_ephemeral(mem, argv[0]); + mem_set_bin_allocated(ctx->pMem, (char *)mem, size); + return; + } + mem = (struct Mem *)ctx->pMem->z; + count = (uint32_t *)(mem + 1); + ++*count; + if (mem_add(mem, argv[0], mem) != 0) + ctx->is_aborted = true; +} + +/** Finalizer for the AVG() function. */ +static void +fin_avg(struct sql_context *ctx) +{ + assert(mem_is_null(ctx->pMem) || mem_is_bin(ctx->pMem)); + if (mem_is_null(ctx->pMem)) + return mem_set_null(ctx->pOut); + struct Mem *tmp = (struct Mem *)ctx->pMem->z; + uint32_t *count_val = (uint32_t *)(tmp + 1); + struct Mem sum; + mem_create(&sum); + mem_copy_as_ephemeral(&sum, tmp); + mem_destroy(tmp); + struct Mem count; + mem_create(&count); + mem_set_uint(&count, *count_val); + if (mem_div(&sum, &count, ctx->pOut) != 0) + ctx->is_aborted = true; +} + static const unsigned char * mem_as_ustr(struct Mem *mem) { @@ -1664,69 +1716,6 @@ soundexFunc(sql_context * context, int argc, sql_value ** argv) } } -/* - * An instance of the following structure holds the context of a - * sum() or avg() aggregate computation. - */ -typedef struct SumCtx SumCtx; -struct SumCtx { - struct Mem mem; - uint32_t count; -}; - -/* - * Routines used to compute the sum, average, and total. - * - * The SUM() function follows the (broken) SQL standard which means - * that it returns NULL if it sums over no inputs. TOTAL returns - * 0.0 in that case. In addition, TOTAL always returns a float where - * SUM might return an integer if it never encounters a floating point - * value. TOTAL never fails, but SUM might through an exception if - * it overflows an integer. - */ -static void -sum_step(struct sql_context *context, int argc, sql_value **argv) -{ - assert(argc == 1); - UNUSED_PARAMETER(argc); - struct SumCtx *p = sql_aggregate_context(context, sizeof(*p)); - if (p == NULL) { - context->is_aborted = true; - return; - } - if (p->count == 0) { - mem_create(&p->mem); - assert(context->func->def->returns == FIELD_TYPE_INTEGER || - context->func->def->returns == FIELD_TYPE_DOUBLE); - if (context->func->def->returns == FIELD_TYPE_INTEGER) - mem_set_uint(&p->mem, 0); - else - mem_set_double(&p->mem, 0.0); - } - if (argv[0]->type == MEM_TYPE_NULL) - return; - ++p->count; - assert(mem_is_num(argv[0])); - if (mem_add(&p->mem, argv[0], &p->mem) != 0) - context->is_aborted = true; -} - -static void -avgFinalize(sql_context * context) -{ - SumCtx *p; - p = sql_aggregate_context(context, 0); - if (p == NULL || p->count == 0) { - mem_set_null(context->pOut); - return; - } - struct Mem mem; - mem_create(&mem); - mem_set_uint(&mem, p->count); - if (mem_div(&p->mem, &mem, context->pOut) != 0) - context->is_aborted = true; -} - /* * The following structure keeps track of state information for the * count() aggregate function. @@ -2023,8 +2012,8 @@ struct sql_func_definition { static struct sql_func_definition definitions[] = { {"ABS", 1, {FIELD_TYPE_INTEGER}, FIELD_TYPE_INTEGER, absFunc, NULL}, {"ABS", 1, {FIELD_TYPE_DOUBLE}, FIELD_TYPE_DOUBLE, absFunc, NULL}, - {"AVG", 1, {FIELD_TYPE_INTEGER}, FIELD_TYPE_INTEGER, sum_step, avgFinalize}, - {"AVG", 1, {FIELD_TYPE_DOUBLE}, FIELD_TYPE_DOUBLE, sum_step, avgFinalize}, + {"AVG", 1, {FIELD_TYPE_INTEGER}, FIELD_TYPE_INTEGER, step_avg, fin_avg}, + {"AVG", 1, {FIELD_TYPE_DOUBLE}, FIELD_TYPE_DOUBLE, step_avg, fin_avg}, {"CHAR", -1, {FIELD_TYPE_INTEGER}, FIELD_TYPE_STRING, charFunc, NULL}, {"CHAR_LENGTH", 1, {FIELD_TYPE_STRING}, FIELD_TYPE_INTEGER, lengthFunc, NULL}, -- 2.25.1