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https://issues.apache.org/jira/browse/IMPALA-12390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17766937#comment-17766937
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ASF subversion and git services commented on IMPALA-12390:
----------------------------------------------------------
Commit 4d15558b5eaa69e872917c8bbf69dc1dc2146bc5 in impala's branch
refs/heads/master from Michael Smith
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=4d15558b5 ]
IMPALA-12390 (part3): Enable unnecessary-copy-initialization
Enables the clang-tidy performance-unnecessary-copy-initialization check
and fixes any issues found with run_clang_tidy.sh.
Change-Id: I217df2598b21551fe21099c2caa5a39865010c20
Reviewed-on: http://gerrit.cloudera.org:8080/20492
Reviewed-by: Joe McDonnell <[email protected]>
Tested-by: Michael Smith <[email protected]>
> Enable performance related clang-tidy checks
> --------------------------------------------
>
> Key: IMPALA-12390
> URL: https://issues.apache.org/jira/browse/IMPALA-12390
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Affects Versions: Impala 4.3.0
> Reporter: Joe McDonnell
> Assignee: Joe McDonnell
> Priority: Major
> Fix For: Impala 4.3.0
>
>
> clang-tidy has several performance-related checks that seem like they would
> be useful to enforce. Here are some examples:
> {noformat}
> /home/joemcdonnell/upstream/Impala/be/src/runtime/types.h:313:25: warning:
> loop variable is copied but only used as const reference; consider making it
> a const reference [performance-for-range-copy]
> for (ColumnType child_type : col_type.children) {
> ~~~~~~~~~~ ^
> const &
> /home/joemcdonnell/upstream/Impala/be/src/catalog/catalog-util.cc:168:34:
> warning: 'find' called with a string literal consisting of a single
> character; consider using the more effective overload accepting a character
> [performance-faster-string-find]
> int pos = object_name.find(".");
> ^~~~
> '.'
> /home/joemcdonnell/upstream/Impala/be/src/util/decimal-util.h:55:53: warning:
> the parameter 'b' is copied for each invocation but only used as a const
> reference; consider making it a const reference
> [performance-unnecessary-value-param]
> static int256_t SafeMultiply(int256_t a, int256_t b, bool may_overflow) {
> ~~~~~~~~ ^
> const &
> /home/joemcdonnell/upstream/Impala/be/src/codegen/llvm-codegen.cc:847:5:
> warning: 'push_back' is called inside a loop; consider pre-allocating the
> vector capacity before the loop [performance-inefficient-vector-operation]
> arguments.push_back(args_[i].type);
> ^{noformat}
> In all, they seem to flag things that developers wouldn't ordinarily notice,
> and it doesn't seem to have too many false positives. We should look into
> enabling these.
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