Zoltán Borók-Nagy created IMPALA-12373:
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Summary: Implement Small String Optimization for StringValue
Key: IMPALA-12373
URL: https://issues.apache.org/jira/browse/IMPALA-12373
Project: IMPALA
Issue Type: Improvement
Reporter: Zoltán Borók-Nagy
Implement Small String Optimization for StringValue.
Current memory layout of StringValue is:
{noformat}
char* ptr; // 8 byte
int len; // 4 byte
{noformat}
For small strings with size up to 8 we could store the string contents in the
bytes of the 'ptr'. Something like that:
{noformat}
union {
char* ptr;
char small_buf[sizeof(ptr)];
}
int len;
{noformat}
Many C++ string implementations use the {{Small String Optimization}} to speed
up work with small strings. For example: {{{}Microsoft STL{}}},
{{{}libstdc++{+}{+}{}}}, {{{}libc++{}}}, {{{}Boost{}}}, {{{}Folly{}}}.
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