[TD-5623]<feature>: Added Global config 'CompressColDaata' to

enable/disable col compression. Default to 0.

src/common/inc/tglobal.h

@@ -60,6 +60,7 @@ extern char     tsLocale[];
 extern char     tsCharset[];            // default encode string
 extern int8_t   tsEnableCoreFile;
 extern int32_t  tsCompressMsgSize;
+extern int32_t  tsCompressColData;
 extern int32_t  tsMaxNumOfDistinctResults;
 extern char     tsTempDir[];
 

src/common/src/tglobal.c

@@ -75,6 +75,14 @@ int32_t tsMaxBinaryDisplayWidth = 30;
  */
 int32_t tsCompressMsgSize = -1;
 
+/* denote if server needs to compress the retrieved column data before adding to the rpc response message body.
+ * 0: disable column data compression
+ * 1: enable  column data compression
+ * This option is default to disabled. Once enabled, compression will be conducted if any column has size more
+ * than QUERY_COMP_THRESHOLD. Otherwise, no further compression is needed.
+ */
+int32_t tsCompressColData = 0;
+
 // client
 int32_t tsMaxSQLStringLen = TSDB_MAX_ALLOWED_SQL_LEN;
 int32_t tsMaxWildCardsLen = TSDB_PATTERN_STRING_MAX_LEN;
@@ -991,6 +999,16 @@ static void doInitGlobalConfig(void) {
   cfg.unitType = TAOS_CFG_UTYPE_NONE;
   taosInitConfigOption(cfg);
 
+  cfg.option = "compressColData";
+  cfg.ptr = &tsCompressColData;
+  cfg.valType = TAOS_CFG_VTYPE_INT8;
+  cfg.cfgType = TSDB_CFG_CTYPE_B_CONFIG | TSDB_CFG_CTYPE_B_SHOW;
+  cfg.minValue = 0;
+  cfg.maxValue = 1;
+  cfg.ptrLength = 0;
+  cfg.unitType = TAOS_CFG_UTYPE_NONE;
+  taosInitConfigOption(cfg);
+
   cfg.option = "maxSQLLength";
   cfg.ptr = &tsMaxSQLStringLen;
   cfg.valType = TAOS_CFG_VTYPE_INT32;

src/query/src/queryMain.c

@@ -357,7 +357,7 @@ int32_t qDumpRetrieveResult(qinfo_t qinfo, SRetrieveTableRsp **pRsp, int32_t *co
   }
 
   (*pRsp)->precision = htons(pQueryAttr->precision);
-  (*pRsp)->compressed = (int8_t)checkNeedToCompressQueryCol(pQInfo);
+  (*pRsp)->compressed = (int8_t)(tsCompressColData && checkNeedToCompressQueryCol(pQInfo));
 
   if (GET_NUM_OF_RESULTS(&(pQInfo->runtimeEnv)) > 0 && pQInfo->code == TSDB_CODE_SUCCESS) {
     doDumpQueryResult(pQInfo, (*pRsp)->data, (*pRsp)->compressed, &compLen);