[fix](memory) fix bug that ~BitShufflePageDecoder destroys uninitialized chunk (#7172)

Added a safe way to destroy Chunk.

be/src/olap/rowset/segment_v2/bitshuffle_page.h

@@ -216,9 +216,7 @@ public:
               _cur_index(0) {}
 
     ~BitShufflePageDecoder() {
-        if (_chunk.size != 0) {
-            ChunkAllocator::instance()->free(_chunk);
-        }
+        ChunkAllocator::instance()->free(_chunk);
     }
 
     Status init() override {

be/src/runtime/memory/chunk.h

@@ -27,9 +27,9 @@ namespace doris {
 // will result in recompilation of all files. So, we put it in a
 // file to keep this file simple and infrequently changed.
 struct Chunk {
-    uint8_t* data;
-    size_t size;
-    int core_id;
+    uint8_t* data = nullptr;
+    size_t size = 0;
+    int core_id = -1;
 };
 
 } // namespace doris

be/src/runtime/memory/chunk_allocator.cpp

@@ -170,6 +170,9 @@ bool ChunkAllocator::allocate(size_t size, Chunk* chunk) {
 }
 
 void ChunkAllocator::free(const Chunk& chunk) {
+    if (chunk.core_id == -1) {
+        return;
+    }
     int64_t old_reserved_bytes = _reserved_bytes;
     int64_t new_reserved_bytes = 0;
     do {
@@ -190,7 +193,6 @@ void ChunkAllocator::free(const Chunk& chunk) {
     _arenas[chunk.core_id]->push_free_chunk(chunk.data, chunk.size);
 }
 
-
 bool ChunkAllocator::allocate_align(size_t size, Chunk* chunk) {
     return allocate(BitUtil::RoundUpToPowerOfTwo(size), chunk);
 }