[TD-6233]<enhance>: make column compression threshold user configurable

src/client/src/tscServer.c

@@ -2678,7 +2678,7 @@ int tscProcessQueryRsp(SSqlObj *pSql) {
   return 0;
 }
 
-static void decompressQueryColData(SSqlRes *pRes, SQueryInfo* pQueryInfo, char **data, int8_t compressed, int compLen) {
+static void decompressQueryColData(SSqlObj *pSql, SSqlRes *pRes, SQueryInfo* pQueryInfo, char **data, int8_t compressed, int32_t compLen) {
   int32_t decompLen = 0;
   int32_t numOfCols = pQueryInfo->fieldsInfo.numOfOutput;
   int32_t *compSizes;
@@ -2715,6 +2715,9 @@ static void decompressQueryColData(SSqlRes *pRes, SQueryInfo* pQueryInfo, char *
     pData = *data + compLen + numOfCols * sizeof(int32_t);
   }
 
+  tscDebug("0x%"PRIx64" decompress col data, compressed size:%d, decompressed size:%d",
+      pSql->self, (int32_t)(compLen + numOfCols * sizeof(int32_t)), decompLen);
+
   int32_t tailLen = pRes->rspLen - sizeof(SRetrieveTableRsp) - decompLen;
   memmove(*data + decompLen, pData, tailLen);
   memmove(*data, outputBuf, decompLen);
@@ -2749,7 +2752,7 @@ int tscProcessRetrieveRspFromNode(SSqlObj *pSql) {
   //Decompress col data if compressed from server
   if (pRetrieve->compressed) {
     int32_t compLen = htonl(pRetrieve->compLen);
-    decompressQueryColData(pRes, pQueryInfo, &pRes->data, pRetrieve->compressed, compLen);
+    decompressQueryColData(pSql, pRes, pQueryInfo, &pRes->data, pRetrieve->compressed, compLen);
   }
 
   STableMetaInfo *pTableMetaInfo = tscGetMetaInfo(pQueryInfo, 0);

src/common/src/tglobal.c

@@ -76,12 +76,11 @@ 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.
+ * 0: all data are compressed
+ * -1: all data are not compressed
+ * other values: if the any retrieved column size is greater than the tsCompressColData, all data will be compressed.
  */
-int32_t tsCompressColData = 0;
+int32_t tsCompressColData = -1;
 
 // client
 int32_t tsMaxSQLStringLen = TSDB_MAX_ALLOWED_SQL_LEN;
@@ -1006,10 +1005,10 @@ static void doInitGlobalConfig(void) {
 
   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.valType = TAOS_CFG_VTYPE_INT32;
+  cfg.cfgType = TSDB_CFG_CTYPE_B_CONFIG | TSDB_CFG_CTYPE_B_CLIENT | TSDB_CFG_CTYPE_B_SHOW;
+  cfg.minValue = -1;
+  cfg.maxValue = 100000000.0f;
   cfg.ptrLength = 0;
   cfg.unitType = TAOS_CFG_UTYPE_NONE;
   taosInitConfigOption(cfg);

src/query/inc/qExecutor.h

@@ -43,9 +43,7 @@ typedef int32_t (*__block_search_fn_t)(char* data, int32_t num, int64_t key, int
 
 #define GET_NUM_OF_RESULTS(_r) (((_r)->outputBuf) == NULL? 0:((_r)->outputBuf)->info.rows)
 
-//TODO: may need to fine tune this threshold
-#define QUERY_COMP_THRESHOLD (1024 * 512)
-#define NEEDTO_COMPRESS_QUERY(size) ((size) > QUERY_COMP_THRESHOLD ? 1 : 0)
+#define NEEDTO_COMPRESS_QUERY(size) ((size) > tsCompressColData? 1 : 0)
 
 enum {
   // when query starts to execute, this status will set

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)(tsCompressColData && checkNeedToCompressQueryCol(pQInfo));
+  (*pRsp)->compressed = (int8_t)((tsCompressColData != -1) && checkNeedToCompressQueryCol(pQInfo));
 
   if (GET_NUM_OF_RESULTS(&(pQInfo->runtimeEnv)) > 0 && pQInfo->code == TSDB_CODE_SUCCESS) {
     doDumpQueryResult(pQInfo, (*pRsp)->data, (*pRsp)->compressed, &compLen);
@@ -367,8 +367,12 @@ int32_t qDumpRetrieveResult(qinfo_t qinfo, SRetrieveTableRsp **pRsp, int32_t *co
 
   if ((*pRsp)->compressed && compLen != 0) {
     int32_t numOfCols = pQueryAttr->pExpr2 ? pQueryAttr->numOfExpr2 : pQueryAttr->numOfOutput;
-    *contLen = *contLen - pQueryAttr->resultRowSize * s + compLen + numOfCols * sizeof(int32_t);
+    int32_t origSize  = pQueryAttr->resultRowSize * s;
+    int32_t compSize  = compLen + numOfCols * sizeof(int32_t);
+    *contLen = *contLen - origSize + compSize;
     *pRsp = (SRetrieveTableRsp *)rpcReallocCont(*pRsp, *contLen);
+    qDebug("QInfo:0x%"PRIx64" compress col data, uncompressed size:%d, compressed size:%d, ratio:%.2f\n",
+        pQInfo->qId, origSize, compSize, (float)origSize / (float)compSize);
   }
   (*pRsp)->compLen = htonl(compLen);