[TD-5623]<feature>: add compression code on server side

src/inc/taosmsg.h

@@ -536,6 +536,7 @@ typedef struct SRetrieveTableRsp {
   int16_t precision;
   int64_t offset;     // updated offset value for multi-vnode projection query
   int64_t useconds;
+  int8_t  compressed;
   char    data[];
 } SRetrieveTableRsp;
 

src/query/inc/qExecutor.h

@@ -43,6 +43,9 @@ 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)
 
+#define QUERY_COMP_THRESHOLD 60
+#define NEEDTO_COMPRESS_QUERY(size) ((size) > QUERY_COMP_THRESHOLD ? 1 : 0)
+
 enum {
   // when query starts to execute, this status will set
       QUERY_NOT_COMPLETED = 0x1u,
@@ -647,7 +650,7 @@ void destroyUdfInfo(SUdfInfo* pUdfInfo);
 
 bool isValidQInfo(void *param);
 
-int32_t doDumpQueryResult(SQInfo *pQInfo, char *data);
+int32_t doDumpQueryResult(SQInfo *pQInfo, char *data, int8_t compressed, int32_t *compLen);
 
 size_t getResultSize(SQInfo *pQInfo, int64_t *numOfRows);
 void setQueryKilled(SQInfo *pQInfo);

src/query/src/qExecutor.c

@@ -4193,7 +4193,15 @@ static void updateNumOfRowsInResultRows(SQueryRuntimeEnv* pRuntimeEnv, SQLFuncti
   }
 }
 
-static void doCopyQueryResultToMsg(SQInfo *pQInfo, int32_t numOfRows, char *data) {
+static int32_t compressQueryColData(SColumnInfoData *pColRes, int32_t numOfRows, char *data, int8_t compressed) {
+  int32_t colLen = pColRes->info.bytes * numOfRows;
+  int32_t colCompLen = (*(tDataTypes[pColRes->info.type].compFunc))(pColRes->pData, colLen, numOfRows, data,
+                                                                 colLen + COMP_OVERFLOW_BYTES, compressed, NULL, 0);
+  data += colCompLen;
+  return colCompLen;
+}
+
+static void doCopyQueryResultToMsg(SQInfo *pQInfo, int32_t numOfRows, char *data, int8_t compressed, int32_t *compLen) {
   SQueryRuntimeEnv* pRuntimeEnv = &pQInfo->runtimeEnv;
   SQueryAttr *pQueryAttr = pRuntimeEnv->pQueryAttr;
 
@@ -4202,14 +4210,22 @@ static void doCopyQueryResultToMsg(SQInfo *pQInfo, int32_t numOfRows, char *data
   if (pQueryAttr->pExpr2 == NULL) {
     for (int32_t col = 0; col < pQueryAttr->numOfOutput; ++col) {
       SColumnInfoData* pColRes = taosArrayGet(pRes->pDataBlock, col);
-      memmove(data, pColRes->pData, pColRes->info.bytes * pRes->info.rows);
-      data += pColRes->info.bytes * pRes->info.rows;
+      if (compressed) {
+        *compLen += compressQueryColData(pColRes, pRes->info.rows, data, compressed);
+      } else {
+        memmove(data, pColRes->pData, pColRes->info.bytes * pRes->info.rows);
+        data += pColRes->info.bytes * pRes->info.rows;
+      }
     }
   } else {
     for (int32_t col = 0; col < pQueryAttr->numOfExpr2; ++col) {
       SColumnInfoData* pColRes = taosArrayGet(pRes->pDataBlock, col);
-      memmove(data, pColRes->pData, pColRes->info.bytes * numOfRows);
-      data += pColRes->info.bytes * numOfRows;
+      if (compressed) {
+        *compLen += compressQueryColData(pColRes, numOfRows, data, compressed);
+      } else {
+        memmove(data, pColRes->pData, pColRes->info.bytes * numOfRows);
+        data += pColRes->info.bytes * numOfRows;
+      }
     }
   }
 
@@ -8695,7 +8711,7 @@ void freeQInfo(SQInfo *pQInfo) {
   tfree(pQInfo);
 }
 
-int32_t doDumpQueryResult(SQInfo *pQInfo, char *data) {
+int32_t doDumpQueryResult(SQInfo *pQInfo, char *data, int8_t compressed, int32_t *compLen) {
   // the remained number of retrieved rows, not the interpolated result
   SQueryRuntimeEnv* pRuntimeEnv = &pQInfo->runtimeEnv;
   SQueryAttr *pQueryAttr = pQInfo->runtimeEnv.pQueryAttr;
@@ -8738,7 +8754,7 @@ int32_t doDumpQueryResult(SQInfo *pQInfo, char *data) {
       setQueryStatus(pRuntimeEnv, QUERY_OVER);
     }
   } else {
-    doCopyQueryResultToMsg(pQInfo, (int32_t)pRuntimeEnv->outputBuf->info.rows, data);
+    doCopyQueryResultToMsg(pQInfo, (int32_t)pRuntimeEnv->outputBuf->info.rows, data, compressed, compLen);
   }
 
   qDebug("QInfo:0x%"PRIx64" current numOfRes rows:%d, total:%" PRId64, pQInfo->qId,

src/query/src/queryMain.c

@@ -324,6 +324,7 @@ int32_t qRetrieveQueryResultInfo(qinfo_t qinfo, bool* buildRes, void* pRspContex
 
 int32_t qDumpRetrieveResult(qinfo_t qinfo, SRetrieveTableRsp **pRsp, int32_t *contLen, bool* continueExec) {
   SQInfo *pQInfo = (SQInfo *)qinfo;
+  int32_t compLen = 0;
 
   if (pQInfo == NULL || !isValidQInfo(pQInfo)) {
     return TSDB_CODE_QRY_INVALID_QHANDLE;
@@ -356,12 +357,19 @@ int32_t qDumpRetrieveResult(qinfo_t qinfo, SRetrieveTableRsp **pRsp, int32_t *co
   }
 
   (*pRsp)->precision = htons(pQueryAttr->precision);
+  (*pRsp)->compressed = NEEDTO_COMPRESS_QUERY(pQueryAttr->resultRowSize * s);
+
   if (GET_NUM_OF_RESULTS(&(pQInfo->runtimeEnv)) > 0 && pQInfo->code == TSDB_CODE_SUCCESS) {
-    doDumpQueryResult(pQInfo, (*pRsp)->data);
+    doDumpQueryResult(pQInfo, (*pRsp)->data, (*pRsp)->compressed, &compLen);
   } else {
     setQueryStatus(pRuntimeEnv, QUERY_OVER);
   }
 
+  if ((*pRsp)->compressed && compLen != 0) {
+    *contLen = *contLen - pQueryAttr->resultRowSize * s + compLen;
+    *pRsp = (SRetrieveTableRsp *)rpcReallocCont(*pRsp, *contLen);
+  }
+
   pQInfo->rspContext = NULL;
   pQInfo->dataReady  = QUERY_RESULT_NOT_READY;