From e3f7e56d5ec2402187d11702af7b4cf414832911 Mon Sep 17 00:00:00 2001
From: YangKeao <yangkeao@chunibyo.icu>
Date: Mon, 13 Feb 2023 18:16:02 +0800
Subject: [PATCH] server, execute: set text for execute command (#41340)

close pingcap/tidb#41156
---
 server/conn_stmt.go | 10 ++++++++++
 server/conn_test.go | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+)

diff --git a/server/conn_stmt.go b/server/conn_stmt.go
index acb12ae660b94..19e77ce222d51 100644
--- a/server/conn_stmt.go
+++ b/server/conn_stmt.go
@@ -263,6 +263,16 @@ func (cc *clientConn) executePreparedStmtAndWriteResult(ctx context.Context, stm
 		BinaryArgs: args,
 		PrepStmt:   prepStmt,
 	}
+
+	// For the combination of `ComPrepare` and `ComExecute`, the statement name is stored in the client side, and the
+	// TiDB only has the ID, so don't try to construct an `EXECUTE SOMETHING`. Use the original prepared statement here
+	// instead.
+	sql := ""
+	planCacheStmt, ok := prepStmt.(*plannercore.PlanCacheStmt)
+	if ok {
+		sql = planCacheStmt.StmtText
+	}
+	execStmt.SetText(charset.EncodingUTF8Impl, sql)
 	rs, err := (&cc.ctx).ExecuteStmt(ctx, execStmt)
 	if err != nil {
 		return true, errors.Annotate(err, cc.preparedStmt2String(uint32(stmt.ID())))
diff --git a/server/conn_test.go b/server/conn_test.go
index 6571d7efd5352..94461685c33c4 100644
--- a/server/conn_test.go
+++ b/server/conn_test.go
@@ -1850,3 +1850,35 @@ func TestAuthSha(t *testing.T) {
 	// fastAuthFail and the rest of the auth process.
 	require.Equal(t, authData, []byte{})
 }
+
+func TestProcessInfoForExecuteCommand(t *testing.T) {
+	store := testkit.CreateMockStore(t)
+	tk := testkit.NewTestKit(t, store)
+	cc := &clientConn{
+		alloc:      arena.NewAllocator(1024),
+		chunkAlloc: chunk.NewAllocator(),
+		pkt: &packetIO{
+			bufWriter: bufio.NewWriter(bytes.NewBuffer(nil)),
+		},
+	}
+	ctx := context.Background()
+
+	tk.MustExec("use test")
+	cc.setCtx(&TiDBContext{Session: tk.Session(), stmts: make(map[int]*TiDBStatement)})
+
+	tk.MustExec("create table t (col1 int)")
+
+	// simple prepare and execute
+	require.NoError(t, cc.handleStmtPrepare(ctx, "select sum(col1) from t"))
+	require.NoError(t, cc.handleStmtExecute(ctx, []byte{0x1, 0x0, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0, 0x0}))
+	require.Equal(t, cc.ctx.Session.ShowProcess().Info, "select sum(col1) from t")
+
+	// prepare and execute with params
+	require.NoError(t, cc.handleStmtPrepare(ctx, "select sum(col1) from t where col1 < ? and col1 > 100"))
+	// 1 params, length of nullBitMap is 1, `0x8, 0x0` represents the type, and the following `0x10, 0x0....` is the param
+	// 10
+	require.NoError(t, cc.handleStmtExecute(ctx, []byte{0x2, 0x0, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0, 0x0,
+		0x1, 0x8, 0x0,
+		0x0A, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}))
+	require.Equal(t, cc.ctx.Session.ShowProcess().Info, "select sum(col1) from t where col1 < ? and col1 > 100")
+}