Tarantool development patches archive
 help / color / mirror / Atom feed
From: Mergen Imeev via Tarantool-patches <tarantool-patches@dev.tarantool.org>
To: v.shpilevoy@tarantool.org
Cc: tarantool-patches@dev.tarantool.org
Subject: [Tarantool-patches] [PATCH v2 10/15] sql: rework COUNT()
Date: Tue, 21 Sep 2021 13:59:23 +0300
Message-ID: <95ca63319d073250a4e310f04d453e85e44c3dfd.1632220375.git.imeevma@gmail.com> (raw)
In-Reply-To: <cover.1632220375.git.imeevma@gmail.com>

This patch does some refactoring for the SQL built-in aggregate function
COUNT().

Part of #4145
---
 src/box/sql/func.c | 64 +++++++++++++++++++---------------------------
 1 file changed, 26 insertions(+), 38 deletions(-)

diff --git a/src/box/sql/func.c b/src/box/sql/func.c
index b5f154fb1..113df423a 100644
--- a/src/box/sql/func.c
+++ b/src/box/sql/func.c
@@ -150,6 +150,29 @@ fin_avg(struct sql_context *ctx)
 		ctx->is_aborted = true;
 }
 
+/** Implementation of the COUNT() function. */
+static void
+step_count(struct sql_context *ctx, int argc, struct Mem **argv)
+{
+	assert(argc == 0 || argc == 1);
+	if (ctx->pMem->type == MEM_TYPE_NULL)
+		mem_set_uint(ctx->pMem, 0);
+	if (argc == 1 && argv[0]->type == MEM_TYPE_NULL)
+		return;
+	assert(ctx->pMem->type == MEM_TYPE_UINT);
+	++ctx->pMem->u.u;
+}
+
+/** Finalizer for the COUNT() function. */
+static void
+fin_count(struct sql_context *ctx)
+{
+	assert(ctx->pMem->type == MEM_TYPE_NULL || mem_is_uint(ctx->pMem));
+	if (ctx->pMem->type == MEM_TYPE_NULL)
+		return mem_set_uint(ctx->pOut, 0);
+	mem_copy_as_ephemeral(ctx->pOut, ctx->pMem);
+}
+
 static const unsigned char *
 mem_as_ustr(struct Mem *mem)
 {
@@ -1704,41 +1727,6 @@ soundexFunc(sql_context * context, int argc, sql_value ** argv)
 	}
 }
 
-/*
- * The following structure keeps track of state information for the
- * count() aggregate function.
- */
-typedef struct CountCtx CountCtx;
-struct CountCtx {
-	i64 n;
-};
-
-/*
- * Routines to implement the count() aggregate function.
- */
-static void
-countStep(sql_context * context, int argc, sql_value ** argv)
-{
-	CountCtx *p;
-	if (argc != 0 && argc != 1) {
-		diag_set(ClientError, ER_FUNC_WRONG_ARG_COUNT,
-			 "COUNT", "0 or 1", argc);
-		context->is_aborted = true;
-		return;
-	}
-	p = sql_aggregate_context(context, sizeof(*p));
-	if ((argc == 0 || !mem_is_null(argv[0])) && p != NULL)
-		p->n++;
-}
-
-static void
-countFinalize(sql_context * context)
-{
-	CountCtx *p;
-	p = sql_aggregate_context(context, 0);
-	sql_result_uint(context, p ? p->n : 0);
-}
-
 /*
  * Routines to implement min() and max() aggregate functions.
  */
@@ -2008,9 +1996,9 @@ static struct sql_func_definition definitions[] = {
 	 NULL},
 	{"COALESCE", -1, {FIELD_TYPE_ANY}, FIELD_TYPE_SCALAR, sql_builtin_stub,
 	 NULL},
-	{"COUNT", 0, {}, FIELD_TYPE_INTEGER, countStep, countFinalize},
-	{"COUNT", 1, {FIELD_TYPE_ANY}, FIELD_TYPE_INTEGER, countStep,
-	 countFinalize},
+	{"COUNT", 0, {}, FIELD_TYPE_INTEGER, step_count, fin_count},
+	{"COUNT", 1, {FIELD_TYPE_ANY}, FIELD_TYPE_INTEGER, step_count,
+	 fin_count},
 
 	{"GREATEST", -1, {FIELD_TYPE_INTEGER}, FIELD_TYPE_INTEGER, minmaxFunc,
 	 NULL},
-- 
2.25.1


  parent reply	other threads:[~2021-09-21 11:04 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <cover.1632220375.git.imeevma@gmail.com>
2021-09-21 10:59 ` [Tarantool-patches] [PATCH v2 01/15] sql: fix possible undefined behavior during cast Mergen Imeev via Tarantool-patches
2021-09-21 10:59 ` [Tarantool-patches] [PATCH v2 02/15] sql: use register P1 for number of arguments Mergen Imeev via Tarantool-patches
2021-09-21 10:59 ` [Tarantool-patches] [PATCH v2 04/15] sql: move collation to struct sql_context Mergen Imeev via Tarantool-patches
2021-09-21 10:59 ` [Tarantool-patches] [PATCH v2 05/15] sql: introduce mem_append() Mergen Imeev via Tarantool-patches
2021-09-25 11:06   ` Mergen Imeev via Tarantool-patches
2021-09-21 10:59 ` [Tarantool-patches] [PATCH v2 06/15] sql: remove sql_vdbemem_finalize() Mergen Imeev via Tarantool-patches
2021-09-22 22:47   ` Vladislav Shpilevoy via Tarantool-patches
2021-09-25 11:13     ` Mergen Imeev via Tarantool-patches
2021-09-21 10:59 ` [Tarantool-patches] [PATCH v2 07/15] sql: rework SUM() Mergen Imeev via Tarantool-patches
2021-09-22 22:48   ` Vladislav Shpilevoy via Tarantool-patches
2021-09-25 11:17     ` Mergen Imeev via Tarantool-patches
2021-09-21 10:59 ` [Tarantool-patches] [PATCH v2 08/15] sql: rework TOTAL() Mergen Imeev via Tarantool-patches
2021-09-25 11:20   ` Mergen Imeev via Tarantool-patches
2021-09-21 10:59 ` [Tarantool-patches] [PATCH v2 09/15] sql: rework AVG() Mergen Imeev via Tarantool-patches
2021-09-22 22:48   ` Vladislav Shpilevoy via Tarantool-patches
2021-09-25 11:32     ` Mergen Imeev via Tarantool-patches
2021-09-21 10:59 ` Mergen Imeev via Tarantool-patches [this message]
2021-09-25 11:34   ` [Tarantool-patches] [PATCH v2 10/15] sql: rework COUNT() Mergen Imeev via Tarantool-patches
2021-09-21 10:59 ` [Tarantool-patches] [PATCH v2 11/15] sql: rework MIN() and MAX() Mergen Imeev via Tarantool-patches
2021-09-25 11:36   ` Mergen Imeev via Tarantool-patches
2021-09-21 10:59 ` [Tarantool-patches] [PATCH v2 12/15] sql: rework GROUP_CONCAT() Mergen Imeev via Tarantool-patches
2021-09-22 22:49   ` Vladislav Shpilevoy via Tarantool-patches
2021-09-25 11:42     ` Mergen Imeev via Tarantool-patches
2021-09-29  7:03       ` Mergen Imeev via Tarantool-patches
2021-09-21 10:59 ` [Tarantool-patches] [PATCH v2 13/15] sql: remove copying of result in finalizers Mergen Imeev via Tarantool-patches
2021-09-22 22:50   ` Vladislav Shpilevoy via Tarantool-patches
2021-09-25 11:47     ` Mergen Imeev via Tarantool-patches
2021-09-21 10:59 ` [Tarantool-patches] [PATCH v2 14/15] sql: remove MEM_TYPE_AGG Mergen Imeev via Tarantool-patches
2021-09-21 10:59 ` [Tarantool-patches] [PATCH v2 15/15] sql: remove field argv from struct sql_context Mergen Imeev via Tarantool-patches
2021-09-22 22:51   ` Vladislav Shpilevoy via Tarantool-patches
2021-09-25 12:03     ` Mergen Imeev via Tarantool-patches

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=95ca63319d073250a4e310f04d453e85e44c3dfd.1632220375.git.imeevma@gmail.com \
    --to=tarantool-patches@dev.tarantool.org \
    --cc=imeevma@tarantool.org \
    --cc=v.shpilevoy@tarantool.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Tarantool development patches archive

This inbox may be cloned and mirrored by anyone:

	git clone --mirror https://lists.tarantool.org/tarantool-patches/0 tarantool-patches/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 tarantool-patches tarantool-patches/ https://lists.tarantool.org/tarantool-patches \
		tarantool-patches@dev.tarantool.org.
	public-inbox-index tarantool-patches

Example config snippet for mirrors.


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git