From ed608ae7217dc18c4fcf60c81c170b2d4e1683b5 Mon Sep 17 00:00:00 2001
From: zhubin79 <18784715772@163.com>
Date: Fri, 15 Nov 2024 15:37:43 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0GUC=E5=8F=82=E6=95=B0?=
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---
 src/bin/gs_guc/cluster_guc.conf                  |  1 +
 src/common/backend/utils/misc/guc.cpp            | 11 +++++++++++
 src/gausskernel/optimizer/commands/indexcmds.cpp |  9 +++++++--
 src/include/knl/knl_guc/knl_session_attr_sql.h   |  1 +
 4 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/src/bin/gs_guc/cluster_guc.conf b/src/bin/gs_guc/cluster_guc.conf
index c09af69fe..39ac3ba83 100755
--- a/src/bin/gs_guc/cluster_guc.conf
+++ b/src/bin/gs_guc/cluster_guc.conf
@@ -839,6 +839,7 @@ uwal_truncate_interval|int|0,7200|NULL|NULL|
 uwal_async_append_switch|bool|0,0|NULL|NULL|
 enable_gazelle_performance_mode|bool|0,0|NULL|NULL|
 enable_aggr_coerce_type|bool|0,0|NULL|NULL|
+enable_default_local_index|bool|0,0|NULL|NULL|
 [cmserver]
 log_dir|string|0,0|NULL|NULL|
 log_file_size|int|0,2047|MB|NULL|
diff --git a/src/common/backend/utils/misc/guc.cpp b/src/common/backend/utils/misc/guc.cpp
index 7e05d6b9b..2993f4fa8 100755
--- a/src/common/backend/utils/misc/guc.cpp
+++ b/src/common/backend/utils/misc/guc.cpp
@@ -2155,6 +2155,17 @@ static void InitConfigureNamesBool()
             NULL,
             NULL,
             NULL},
+        {{"enable_default_local_index",
+            PGC_USERSET,
+            NODE_ALL,
+            ERROR_HANDLING_OPTIONS,
+            gettext_noop("Enable create index default behavior is local index"),
+            NULL},
+            &u_sess->attr.attr_sql.enable_default_local_index,
+            false,
+            NULL,
+            NULL,
+            NULL}, 
 #ifdef ENABLE_HTAP
         {{"enable_parallel_populate",
           PGC_USERSET,
diff --git a/src/gausskernel/optimizer/commands/indexcmds.cpp b/src/gausskernel/optimizer/commands/indexcmds.cpp
index 4211158a4..285d5bd35 100644
--- a/src/gausskernel/optimizer/commands/indexcmds.cpp
+++ b/src/gausskernel/optimizer/commands/indexcmds.cpp
@@ -536,8 +536,13 @@ void SetPartionIndexType(IndexStmt* stmt, Relation rel, bool is_alter_table)
             stmt->isGlobal = !CheckIdxParamsOwnPartKey(rel, stmt->indexParams);
         }
     } else if (!stmt->isPartitioned) {
-        /* default partition index is set to Global index */
-        stmt->isGlobal = (!DEFAULT_CREATE_LOCAL_INDEX ? true : stmt->isGlobal);
+        /*
+         * default partition index is set to Global index.
+         * if B compatibility and enable_default_local_index is true, set Local index.
+         */
+        if (!DEFAULT_CREATE_LOCAL_INDEX
+            && !(DB_IS_CMPT(B_FORMAT) && u_sess->attr.attr_sql.enable_default_local_index))
+            stmt->isGlobal = true;
     }
     stmt->isPartitioned = true;
 #ifndef ENABLE_MULTIPLE_NODES
diff --git a/src/include/knl/knl_guc/knl_session_attr_sql.h b/src/include/knl/knl_guc/knl_session_attr_sql.h
index 22a81ff36..ee06242da 100644
--- a/src/include/knl/knl_guc/knl_session_attr_sql.h
+++ b/src/include/knl/knl_guc/knl_session_attr_sql.h
@@ -268,6 +268,7 @@ typedef struct knl_session_attr_sql {
     bool dolphin;
     bool whale;
     bool enable_vector_targetlist;
+    bool enable_default_local_index;
 #endif
 } knl_session_attr_sql;