TD-90

src/tsdb/inc/tsdbMain.h

@@ -69,11 +69,13 @@ typedef struct {
 } SMemTable;
 
 // ---------- TSDB TABLE DEFINITION
+#define TSDB_MAX_TABLE_SCHEMAS 16
 typedef struct STable {
   int8_t         type;
   STableId       tableId;
   uint64_t       superUid;  // Super table UID
-  STSchema *     schema;
+  int16_t        numOfSchemas;
+  STSchema **    schema;
   STSchema *     tagSchema;
   SKVRow         tagVal;
   SMemTable *    mem;

src/tsdb/src/tsdbMeta.c

@@ -43,12 +43,18 @@ void tsdbEncodeTable(STable *pTable, char *buf, int *contLen) {
   T_APPEND_MEMBER(ptr, pTable, STable, superUid);
 
   if (pTable->type == TSDB_SUPER_TABLE) {
-    ptr = tdEncodeSchema(ptr, pTable->schema);
+    T_APPEND_MEMBER(ptr, pTable, STable, numOfSchemas);
+    for (int i = 0; i < pTable->numOfSchemas; i++) {
+      ptr = tdEncodeSchema(ptr, pTable->schema[i]);
+    }
     ptr = tdEncodeSchema(ptr, pTable->tagSchema);
   } else if (pTable->type == TSDB_CHILD_TABLE) {
     ptr = tdEncodeKVRow(ptr, pTable->tagVal);
   } else {
-    ptr = tdEncodeSchema(ptr, pTable->schema);
+    T_APPEND_MEMBER(ptr, pTable, STable, numOfSchemas);
+    for (int i = 0; i < pTable->numOfSchemas; i++) {
+      ptr = tdEncodeSchema(ptr, pTable->schema[i]);
+    }
   }
 
   if (pTable->type == TSDB_STREAM_TABLE) {
@@ -71,6 +77,11 @@ void tsdbEncodeTable(STable *pTable, char *buf, int *contLen) {
 STable *tsdbDecodeTable(void *cont, int contLen) {
   STable *pTable = (STable *)calloc(1, sizeof(STable));
   if (pTable == NULL) return NULL;
+  pTable->schema = (STSchema **)malloc(sizeof(STSchema *) * TSDB_MAX_TABLE_SCHEMAS);
+  if (pTable->schema == NULL) {
+    free(pTable);
+    return NULL;
+  }
 
   void *ptr = cont;
   T_READ_MEMBER(ptr, int8_t, pTable->type);
@@ -88,12 +99,18 @@ STable *tsdbDecodeTable(void *cont, int contLen) {
   T_READ_MEMBER(ptr, uint64_t, pTable->superUid);
 
   if (pTable->type == TSDB_SUPER_TABLE) {
-    pTable->schema = tdDecodeSchema(&ptr);
+    T_READ_MEMBER(ptr, int16_t, pTable->numOfSchemas);
+    for (int i = 0; i < pTable->numOfSchemas; i++) {
+      pTable->schema[i] = tdDecodeSchema(&ptr);
+    }
     pTable->tagSchema = tdDecodeSchema(&ptr);
   } else if (pTable->type == TSDB_CHILD_TABLE) {
     ptr = tdDecodeKVRow(ptr, &pTable->tagVal);
   } else {
-    pTable->schema = tdDecodeSchema(&ptr);
+    T_READ_MEMBER(ptr, int16_t, pTable->numOfSchemas);
+    for (int i = 0; i < pTable->numOfSchemas; i++) {
+      pTable->schema[i] = tdDecodeSchema(&ptr);
+    }
   }
 
   if (pTable->type == TSDB_STREAM_TABLE) {
@@ -221,13 +238,14 @@ int32_t tsdbFreeMeta(STsdbMeta *pMeta) {
   return 0;
 }
 
+// Get the newest table schema
 STSchema *tsdbGetTableSchema(STsdbMeta *pMeta, STable *pTable) {
   if (pTable->type == TSDB_NORMAL_TABLE || pTable->type == TSDB_SUPER_TABLE || pTable->type == TSDB_STREAM_TABLE) {
-    return pTable->schema;
+    return pTable->schema[pTable->numOfSchemas - 1];
   } else if (pTable->type == TSDB_CHILD_TABLE) {
     STable *pSuper = tsdbGetTableByUid(pMeta, pTable->superUid);
     if (pSuper == NULL) return NULL;
-    return pSuper->schema;
+    return pSuper->schema[pSuper->numOfSchemas-1];
   } else {
     return NULL;
   }
@@ -299,13 +317,16 @@ static STable *tsdbNewTable(STableCfg *pCfg, bool isSuper) {
   }
 
   pTable->type = pCfg->type;
+  pTable->numOfSchemas = 0;
 
   if (isSuper) {
     pTable->type = TSDB_SUPER_TABLE;
     pTable->tableId.uid = pCfg->superUid;
     pTable->tableId.tid = -1;
     pTable->superUid = TSDB_INVALID_SUPER_TABLE_ID;
-    pTable->schema = tdDupSchema(pCfg->schema);
+    pTable->schema = (STSchema **)malloc(sizeof(STSchema *) * TSDB_MAX_TABLE_SCHEMAS);
+    pTable->numOfSchemas = 1;
+    pTable->schema[0] = tdDupSchema(pCfg->schema);
     pTable->tagSchema = tdDupSchema(pCfg->tagSchema);
 
     tsize = strnlen(pCfg->sname, TSDB_TABLE_NAME_LEN);
@@ -340,16 +361,20 @@ static STable *tsdbNewTable(STableCfg *pCfg, bool isSuper) {
     if (pCfg->type == TSDB_CHILD_TABLE) {
       pTable->superUid = pCfg->superUid;
       pTable->tagVal = tdKVRowDup(pCfg->tagValues);
-    } else if (pCfg->type == TSDB_NORMAL_TABLE) {
+    } else {
+      pTable->schema = (STSchema **)malloc(sizeof(STSchema *) * TSDB_MAX_TABLE_SCHEMAS);
+      pTable->numOfSchemas = 1;
+      pTable->schema[0] = tdDupSchema(pCfg->schema);
+
+      if (pCfg->type == TSDB_NORMAL_TABLE) {
         pTable->superUid = -1;
-      pTable->schema = tdDupSchema(pCfg->schema);
       } else {
         ASSERT(pCfg->type == TSDB_STREAM_TABLE);
         pTable->superUid = -1;
-      pTable->schema = tdDupSchema(pCfg->schema);
         pTable->sql = strdup(pCfg->sql);
       }
     }
+  }
 
   return pTable;
 
@@ -580,7 +605,7 @@ static int tsdbFreeTable(STable *pTable) {
   if (pTable->type == TSDB_CHILD_TABLE) {
     kvRowFree(pTable->tagVal);
   } else {
-    tdFreeSchema(pTable->schema);
+    for (int i = 0; i < pTable->numOfSchemas; i++) tdFreeSchema(pTable->schema[i]);
   }
 
   if (pTable->type == TSDB_STREAM_TABLE) {
@@ -642,9 +667,10 @@ static int tsdbAddTableToMeta(STsdbMeta *pMeta, STable *pTable, bool addIdx) {
   }
 
   // Update the pMeta->maxCols and pMeta->maxRowBytes
-  if (pTable->type == TSDB_SUPER_TABLE || pTable->type == TSDB_NORMAL_TABLE) {
-    if (schemaNCols(pTable->schema) > pMeta->maxCols) pMeta->maxCols = schemaNCols(pTable->schema);
-    int bytes = dataRowMaxBytesFromSchema(pTable->schema);
+  if (pTable->type == TSDB_SUPER_TABLE || pTable->type == TSDB_NORMAL_TABLE || pTable->type == TSDB_STREAM_TABLE) {
+    if (schemaNCols(pTable->schema[pTable->numOfSchemas - 1]) > pMeta->maxCols)
+      pMeta->maxCols = schemaNCols(pTable->schema[pTable->numOfSchemas - 1]);
+    int bytes = dataRowMaxBytesFromSchema(pTable->schema[pTable->numOfSchemas - 1]);
     if (bytes > pMeta->maxRowBytes) pMeta->maxRowBytes = bytes;
   }