[improvement](bitmap) Use shared_ptr in BitmapValue to avoid deep copying #19101
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be/src/util/bitmap_value.h
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| BitmapValue& operator=(const BitmapValue& other) { | ||
| _type = other._type; | ||
| _sv = other._sv; | ||
| _bitmap = other._bitmap; | ||
| return *this; | ||
| } |
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warning: use '= default' to define a trivial copy-assignment operator [modernize-use-equals-default]
| BitmapValue& operator=(const BitmapValue& other) { | |
| _type = other._type; | |
| _sv = other._sv; | |
| _bitmap = other._bitmap; | |
| return *this; | |
| } | |
| BitmapValue& operator=(const BitmapValue& other) = default; |
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clang-tidy review says "All clean, LGTM! 👍" |
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TeamCity pipeline, clickbench performance test result: |
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run buildall |
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clang-tidy review says "All clean, LGTM! 👍" |
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run buildall |
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clang-tidy review says "All clean, LGTM! 👍" |
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run buildall |
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clang-tidy review says "All clean, LGTM! 👍" |
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run buildall |
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clang-tidy review says "All clean, LGTM! 👍" |
| return; | ||
| } | ||
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| if (_bitmap.use_count() > 1) { |
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感觉这里用use count 可能不太好，不如记录一个标记位，比如is_owner 这样的，然后再copy constructor 还有operator=的时候，都把is_owner 设置为false；prepare for write的时候，设置为true。
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如果is owner == true，就直接return了。 我觉得一个bool 的判断效率要比 shared ptr use count 高
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run buildall |
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clang-tidy review says "All clean, LGTM! 👍" |
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TeamCity pipeline, clickbench performance test result: |
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clang-tidy review says "All clean, LGTM! 👍" |
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run buildall |
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TeamCity pipeline, clickbench performance test result: |
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PR approved by at least one committer and no changes requested. |
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PR approved by anyone and no changes requested. |
…ying (apache#19101) Currently bitmapvalue type is copied between columns, it cost a lot of memory. Use a shared ptr in bitmap value to avoid copy data.
…ying (apache#19101) (apache#21271) Currently bitmapvalue type is copied between columns, it cost a lot of memory. Use a shared ptr in bitmap value to avoid copy data.
Proposed changes
Currently bitmapvalue type is copied between columns, it cost a lot of memory. Use a shared ptr in bitmap value to avoid copy data.
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