Merge branch '2.0' of https://github.com/taosdata/TDengine into 2.0

src/vnode/cache/inc/cache.h

 #if !defined(_TD_CACHE_H_)
 #define _TD_CACHE_H_
 
+#define TD_MIN_CACHE_BLOCK_SIZE 1024*1024    /* 1M */
+#define TD_MAX_CACHE_BLOCK_SIZE 64*1024*1024 /* 64M */
+
 typedef void cache_pool_t;
 
 typedef struct SCacheBlock
 {
-    SCacheBlock *next;
-    SCacheBlock *prev;
+    int32_t blockId;
     char data[];
 } SCacheBlock;
 

src/vnode/common/catalog/inc/schema.h

@@ -3,6 +3,7 @@
 
 #include <stdint.h>
 
+#include "tstring.h"
 #include "type.h"
 
 typedef struct _scolumn {
@@ -15,4 +16,25 @@ typedef struct SSchema {
   SColumn *columns;
 } SSchema;
 
+// Column with version
+typedef struct {
+  td_datatype_t type;
+  int32_t colId;
+  int32_t bytes;
+} SVColumn;
+
+// Schema with version
+typedef struct {
+  int32_t version;      // Schema with version
+  int32_t numOfCols;
+  int32_t columnId;
+  SVColumn *columns;
+} SVSchema;
+
+int32_t tdAddColumnToSchema(tstring_t pSchema, SColumn col);
+
+td_datatype_t tdGetTypeOfCol(SSchema *pSchema, int32_t col);
+int32_t tdGetLengthOfCol(SSchema *pSchema, int32_t col);
+
+
 #endif  // _TD_SCHEMA_H_

src/vnode/common/data/inc/data.h

@@ -3,6 +3,8 @@
 
 #include <stdint.h>
 
+#include "schema.h"
+
 /* The row data should in the form of
  */
 

src/vnode/common/datastructure/inc/dlist.h

+// A doubly linked list
+#if !defined(_TD_DLIST_H_)
+#define _TD_DLIST_H_
+
+#include <stdint.h>
+
+typedef struct {
+  SListNode *prev;
+  SListNode *next;
+  void *     data;
+} SListNode;
+
+// Doubly linked list
+typedef struct {
+    SListNode *head;
+    SListNode *tail;
+    int32_t length;
+} SDList;
+
+// ----- Set operation
+#define TD_GET_DLIST_LENGTH(pDList) (((SDList *)pDList)->length)
+#define TD_GET_DLIST_HEAD(pDList) (((SDList *)pDList)->head)
+#define TD_GET_DLIST_TAIL(pDList) (((SDList *)pDList)->tail)
+
+#define TD_GET_DLIST_NEXT_NODE(pDNode) (((SListNode *)pDNode)->next)
+#define TD_GET_DLIST_PREV_NODE(pDNode) (((SListNode *)pDNode)->prev)
+#define TD_GET_DLIST_NODE_DATA(pDNode) (((SListNode *)pDNode)->data)
+
+#endif  // _TD_DLIST_H_

src/vnode/common/tstr/inc/tstring.h

+/* A dynamic string library
+ */ 
+#if !defined(_TD_TSTRING_H_)
+#define _TD_TSTRING_H_
+
+#include <stdint.h>
+
+typedef char* tstring_t;
+
+// The string header
+typedef struct {
+    int32_t strLen;  // Allocated data space
+    int32_t avail;   // Available space
+    char data[];
+} STStrHdr;
+
+// Get the data length of the string
+#define TSTRLEN(pstr) ((STStrHdr *)pstr)->strLen
+// Get the available space
+#define TSTRAVAIL(pstr) ((STStrHdr *)pstr)->avail
+// Get the real allocated string length
+#define TSTRRLEN(pstr) ((STStrHdr *)pstr)->strLen + sizeof(STStrHdr)
+
+#endif // _TD_TSTRING_H_

src/vnode/tsdb/inc/tsdbCache.h

@@ -4,11 +4,19 @@
 #include <stdint.h>
 
 #include "cache.h"
+#include "dlist.h"
 
+typedef struct {
+  int64_t      blockId;
+  SCacheBlock *pBlock
+} STSDBCacheBlock;
+
+// Use a doublely linked list to implement this
 typedef struct STSDBCache {
   int64_t blockId;  // A block ID counter
-    SCacheBlock *blockList;
+  SDList *cacheList;
 } STSDBCache;
 
+STSDBCache *tsdbCreateCache();
 
 #endif  // _TD_TSDBCACHE_H_