From fee5d40e07e105be1f1560443ca990ac73457d59 Mon Sep 17 00:00:00 2001
From: 924060929 <lanhuajian@selectdb.com>
Date: Fri, 9 May 2025 17:09:07 +0800
Subject: [PATCH] [fix](planner) fix show variable display wrong
 enable_nereids_planner value (#50746)

### What problem does this PR solve?

fix show variable display wrong enable_nereids_planner value, introduced
by #49913

### Release note

None

### Check List (For Author)

- Test <!-- At least one of them must be included. -->
    - [x] Regression test
    - [ ] Unit Test
    - [ ] Manual test (add detailed scripts or steps below)
    - [ ] No need to test or manual test. Explain why:
- [ ] This is a refactor/code format and no logic has been changed.
        - [ ] Previous test can cover this change.
        - [ ] No code files have been changed.
        - [ ] Other reason <!-- Add your reason?  -->

- Behavior changed:
    - [x] No.
    - [ ] Yes. <!-- Explain the behavior change -->

- Does this need documentation?
    - [ ] No.
- [ ] Yes. <!-- Add document PR link here. eg:
https://github.com/apache/doris-website/pull/1214 -->

### Check List (For Reviewer who merge this PR)

- [ ] Confirm the release note
- [ ] Confirm test cases
- [ ] Confirm document
- [ ] Add branch pick label <!-- Add branch pick label that this PR
should merge into -->
---
 .../src/main/java/org/apache/doris/qe/StmtExecutor.java  | 4 +++-
 .../suites/show_p0/test_show_variables.groovy            | 9 ++++++++-
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/fe/fe-core/src/main/java/org/apache/doris/qe/StmtExecutor.java b/fe/fe-core/src/main/java/org/apache/doris/qe/StmtExecutor.java
index ae8b3b84f6..1d1a93e92e 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/qe/StmtExecutor.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/qe/StmtExecutor.java
@@ -62,6 +62,7 @@ import org.apache.doris.analysis.SetType;
 import org.apache.doris.analysis.SetVar;
 import org.apache.doris.analysis.SetVar.SetVarType;
 import org.apache.doris.analysis.ShowStmt;
+import org.apache.doris.analysis.ShowVariablesStmt;
 import org.apache.doris.analysis.SqlParser;
 import org.apache.doris.analysis.SqlScanner;
 import org.apache.doris.analysis.StatementBase;
@@ -900,7 +901,8 @@ public class StmtExecutor {
                 throw new TException("This is in a transaction, only insert, commit, rollback is acceptable.");
             }
             SessionVariable sessionVariable = context.getSessionVariable();
-            if (!(parsedStmt instanceof SetStmt) && !(parsedStmt instanceof UnsetVariableStmt)) {
+            if (!(parsedStmt instanceof SetStmt) && !(parsedStmt instanceof UnsetVariableStmt)
+                    && !(parsedStmt instanceof ShowVariablesStmt)) {
                 sessionVariable.disableNereidsPlannerOnce();
             }
 
diff --git a/regression-test/suites/show_p0/test_show_variables.groovy b/regression-test/suites/show_p0/test_show_variables.groovy
index 6de8075b63..f188fd794f 100644
--- a/regression-test/suites/show_p0/test_show_variables.groovy
+++ b/regression-test/suites/show_p0/test_show_variables.groovy
@@ -34,5 +34,12 @@ suite("test_show_variables", "p0") {
     result = sql """show variables like "enable_cooldown_replica_affinity%";"""
     assertTrue(result[0][1]=="false")
     result = sql """set GLOBAL enable_cooldown_replica_affinity=true;"""
-    
+
+    sql "set enable_nereids_planner=true"
+    result = sql "show variables like '%enable_nereids_planner%'"
+    assertTrue(result[0][1]=="true")
+
+    sql "set enable_nereids_planner=false"
+    result = sql "show variables like '%enable_nereids_planner%'"
+    assertTrue(result[0][1]=="false")
 }