From f0b6a7051735257de2079c503ea3e00bd43c42d6 Mon Sep 17 00:00:00 2001
From: Mergen Imeev <imeevma@gmail.com>
Date: Thu, 9 Sep 2021 18:37:00 +0300
Subject: [PATCH] sql: refactor GROUP_CONCAT() function
Part of #4145
---
src/box/sql/func.c | 117 ++++++++++++++++++---------------------------
1 file changed, 46 insertions(+), 71 deletions(-)
diff --git a/src/box/sql/func.c b/src/box/sql/func.c
index 531facdb91..1c8ad27d81 100644
--- a/src/box/sql/func.c
+++ b/src/box/sql/func.c
@@ -214,6 +214,48 @@ fin_minmax(struct sql_context *ctx)
mem_copy(ctx->pOut, ctx->pMem);
}
+/** Implementation of the GROUP_CONCAT() function. */
+static void
+step_group_concat(struct sql_context *ctx, int argc, struct Mem **argv)
+{
+ assert(argc == 1 || argc == 2);
+ (void)argc;
+ if (mem_is_null(argv[0]))
+ return;
+ assert(mem_is_str(argv[0]) || mem_is_bin(argv[0]));
+ if (mem_is_null(ctx->pMem)) {
+ if (mem_copy(ctx->pMem, argv[0]) != 0)
+ ctx->is_aborted = true;
+ return;
+ }
+ const char *sep = NULL;
+ int sep_len = 0;
+ if (argc == 1) {
+ sep = ",";
+ sep_len = 1;
+ } else if (mem_is_null(argv[1])) {
+ sep = "";
+ sep_len = 0;
+ } else {
+ assert(mem_is_same_type(argv[0], argv[1]));
+ sep = argv[1]->z;
+ sep_len = argv[1]->n;
+ }
+ if (mem_append(ctx->pMem, sep, sep_len) != 0) {
+ ctx->is_aborted = true;
+ return;
+ }
+ if (mem_append(ctx->pMem, argv[0]->z, argv[0]->n) != 0)
+ ctx->is_aborted = true;
+}
+
+/** Finalizer for the GROUP_CONCAT() function. */
+static void
+fin_group_concat(struct sql_context *ctx)
+{
+ mem_copy(ctx->pOut, ctx->pMem);
+}
+
static const unsigned char *
mem_as_ustr(struct Mem *mem)
{
@@ -1765,73 +1807,6 @@ soundexFunc(sql_context * context, int argc, sql_value ** argv)
}
}
-/*
- * group_concat(EXPR, ?SEPARATOR?)
- */
-static void
-groupConcatStep(sql_context * context, int argc, sql_value ** argv)
-{
- const char *zVal;
- StrAccum *pAccum;
- const char *zSep;
- int nVal, nSep;
- if (argc != 1 && argc != 2) {
- diag_set(ClientError, ER_FUNC_WRONG_ARG_COUNT,
- "GROUP_CONCAT", "1 or 2", argc);
- context->is_aborted = true;
- return;
- }
- if (mem_is_null(argv[0]))
- return;
- pAccum =
- (StrAccum *) sql_aggregate_context(context, sizeof(*pAccum));
-
- if (pAccum) {
- sql *db = sql_context_db_handle(context);
- int firstTerm = pAccum->mxAlloc == 0;
- pAccum->mxAlloc = db->aLimit[SQL_LIMIT_LENGTH];
- if (!firstTerm) {
- if (argc == 2) {
- zSep = mem_as_str0(argv[1]);
- nSep = mem_len_unsafe(argv[1]);
- } else {
- zSep = ",";
- nSep = 1;
- }
- if (zSep)
- sqlStrAccumAppend(pAccum, zSep, nSep);
- }
- zVal = mem_as_str0(argv[0]);
- nVal = mem_len_unsafe(argv[0]);
- if (zVal)
- sqlStrAccumAppend(pAccum, zVal, nVal);
- }
-}
-
-static void
-groupConcatFinalize(sql_context * context)
-{
- StrAccum *pAccum;
- pAccum = sql_aggregate_context(context, 0);
- if (pAccum) {
- if (pAccum->accError == STRACCUM_TOOBIG) {
- diag_set(ClientError, ER_SQL_EXECUTE, "string or binary"\
- "string is too big");
- context->is_aborted = true;
- } else if (pAccum->accError == STRACCUM_NOMEM) {
- context->is_aborted = true;
- } else {
- char *str = sqlStrAccumFinish(pAccum);
- int len = pAccum->nChar;
- assert(len >= 0);
- if (context->func->def->returns == FIELD_TYPE_STRING)
- mem_set_str_dynamic(context->pOut, str, len);
- else
- mem_set_bin_dynamic(context->pOut, str, len);
- }
- }
-}
-
int
sql_is_like_func(struct Expr *expr)
{
@@ -1998,13 +1973,13 @@ static struct sql_func_definition definitions[] = {
NULL},
{"GROUP_CONCAT", 1, {FIELD_TYPE_STRING}, FIELD_TYPE_STRING,
- groupConcatStep, groupConcatFinalize},
+ step_group_concat, fin_group_concat},
{"GROUP_CONCAT", 2, {FIELD_TYPE_STRING, FIELD_TYPE_STRING},
- FIELD_TYPE_STRING, groupConcatStep, groupConcatFinalize},
+ FIELD_TYPE_STRING, step_group_concat, fin_group_concat},
{"GROUP_CONCAT", 1, {FIELD_TYPE_VARBINARY}, FIELD_TYPE_VARBINARY,
- groupConcatStep, groupConcatFinalize},
+ step_group_concat, fin_group_concat},
{"GROUP_CONCAT", 2, {FIELD_TYPE_VARBINARY, FIELD_TYPE_VARBINARY},
- FIELD_TYPE_VARBINARY, groupConcatStep, groupConcatFinalize},
+ FIELD_TYPE_VARBINARY, step_group_concat, fin_group_concat},
{"HEX", 1, {FIELD_TYPE_VARBINARY}, FIELD_TYPE_STRING, hexFunc, NULL},
{"IFNULL", 2, {FIELD_TYPE_ANY, FIELD_TYPE_ANY}, FIELD_TYPE_SCALAR,
--
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