[doris] branch opt_perf updated: [Improvement](string) Optimize string comparion (#12947)

[gabriellee]

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


The following commit(s) were added to refs/heads/opt_perf by this push:
     new 22085b265b [Improvement](string) Optimize string comparion (#12947)
22085b265b is described below

commit 22085b265bd3feef4d23b8dbe75edb1e878a8438
Author: Gabriel <gabrielleeb...@gmail.com>
AuthorDate: Sun Sep 25 00:36:26 2022 +0800

    [Improvement](string) Optimize string comparion (#12947)
---
 be/src/runtime/string_value.h | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/be/src/runtime/string_value.h b/be/src/runtime/string_value.h
index 13b3852a5d..fe5d6df5c5 100644
--- a/be/src/runtime/string_value.h
+++ b/be/src/runtime/string_value.h
@@ -137,7 +137,12 @@ struct StringValue {
         return string_compare(this->ptr, this->len, other.ptr, other.len, 
this->len) == 0;
     }
 
-    bool operator==(const StringValue& other) const { return eq(other); }
+    bool operator==(const StringValue& other) const {
+        if (this->len == 0 && other.len == 0) {
+            return true;
+        }
+        return eq(other);
+    }
     // !=
     bool ne(const StringValue& other) const { return !eq(other); }
     // <=
@@ -149,7 +154,12 @@ struct StringValue {
     // >
     bool gt(const StringValue& other) const { return compare(other) > 0; }
 
-    bool operator!=(const StringValue& other) const { return ne(other); }
+    bool operator!=(const StringValue& other) const {
+        if (this->len == 0 && other.len == 0) {
+            return false;
+        }
+        return ne(other);
+    }
 
     bool operator<=(const StringValue& other) const { return le(other); }
 


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