From 2b3ff4d88897c40ee65a72e384e0deff3ee538ea Mon Sep 17 00:00:00 2001
From: Haojun Liao <hjliao@taosdata.com>
Date: Sat, 4 Jun 2022 14:22:30 +0800
Subject: [PATCH] fix: update the column type in show.

---
 source/common/src/systable.c        |  2 +-
 source/dnode/mnode/impl/src/mndDb.c | 11 ++++++++---
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/source/common/src/systable.c b/source/common/src/systable.c
index da42a955ba..2b59354d60 100644
--- a/source/common/src/systable.c
+++ b/source/common/src/systable.c
@@ -87,7 +87,7 @@ static const SSysDbTableSchema userDBSchema[] = {
     {.name = "wal", .bytes = 1, .type = TSDB_DATA_TYPE_TINYINT},
     {.name = "fsync", .bytes = 4, .type = TSDB_DATA_TYPE_INT},
     {.name = "comp", .bytes = 1, .type = TSDB_DATA_TYPE_TINYINT},
-    {.name = "cache_model", .bytes = 10 + VARSTR_HEADER_SIZE, .type = TSDB_DATA_TYPE_VARCHAR},
+    {.name = "cache_model", .bytes = 1, .type = TSDB_DATA_TYPE_TINYINT},
     {.name = "precision", .bytes = 2 + VARSTR_HEADER_SIZE, .type = TSDB_DATA_TYPE_VARCHAR},
     {.name = "single_stable_model", .bytes = 1, .type = TSDB_DATA_TYPE_BOOL},
     {.name = "status", .bytes = 10 + VARSTR_HEADER_SIZE, .type = TSDB_DATA_TYPE_VARCHAR},
diff --git a/source/dnode/mnode/impl/src/mndDb.c b/source/dnode/mnode/impl/src/mndDb.c
index 41f8d741a6..c0460ee8bf 100644
--- a/source/dnode/mnode/impl/src/mndDb.c
+++ b/source/dnode/mnode/impl/src/mndDb.c
@@ -1571,14 +1571,19 @@ static void dumpDbInfoData(SSDataBlock *pBlock, SDbObj *pDb, SShowObj *pShow, in
     pColInfo = taosArrayGet(pBlock->pDataBlock, cols++);
 
     STR_WITH_SIZE_TO_VARSTR(strict, src, strlen(src));
-
+#if 0
     char cacheModel[24] = {0};
+    bool null = false;
     if (pDb->cfg.cacheLastRow == 0) {
       STR_TO_VARSTR(cacheModel, "no_cache");
+    } else if (pDb->cfg.cacheLastRow == 1) {
+      STR_TO_VARSTR(cacheModel, "last_row_cache")
     } else {
-      //
+      null = true;
     }
-    colDataAppend(pColInfo, rows, cacheModel, false);
+    colDataAppend(pColInfo, rows, cacheModel, null);
+#endif
+    colDataAppend(pColInfo, rows, (const char*) &pDb->cfg.cacheLastRow, false);
 
     char *prec = NULL;
     switch (pDb->cfg.precision) {