[doris] branch master updated: [fix]Make sure only call once set_dict_encoding_type for each ColumnReader (#10389)

[yi...@apache.org]

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yiguolei pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/doris.git


The following commit(s) were added to refs/heads/master by this push:
     new 7921320124 [fix]Make sure only call once set_dict_encoding_type for each ColumnReader (#10389)
7921320124 is described below

commit 7921320124b05f87ac71c38b3a2d2fbc2e7b1361
Author: Jerry Hu <mr...@gmail.com>
AuthorDate: Sat Jun 25 04:31:19 2022 +0800

    [fix]Make sure only call once set_dict_encoding_type for each ColumnReader (#10389)
---
 be/src/olap/rowset/segment_v2/column_reader.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/be/src/olap/rowset/segment_v2/column_reader.h b/be/src/olap/rowset/segment_v2/column_reader.h
index 1312a0eb89..b82dbabb01 100644
--- a/be/src/olap/rowset/segment_v2/column_reader.h
+++ b/be/src/olap/rowset/segment_v2/column_reader.h
@@ -138,7 +138,9 @@ public:
 
     uint64_t num_rows() { return _num_rows; }
 
-    void set_dict_encoding_type(DictEncodingType type) { _dict_encoding_type = type; }
+    void set_dict_encoding_type(DictEncodingType type) {
+        std::call_once(_set_dict_encoding_type_flag, [&] { _dict_encoding_type = type; });
+    }
 
     DictEncodingType get_dict_encoding_type() { return _dict_encoding_type; }
 
@@ -202,6 +204,8 @@ private:
     std::unique_ptr<BloomFilterIndexReader> _bloom_filter_index;
 
     std::vector<std::unique_ptr<ColumnReader>> _sub_readers;
+
+    std::once_flag _set_dict_encoding_type_flag;
 };
 
 // Base iterator to read one column data


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