Part#2 MCOL-495 Make string comparison not case sensitive

Fixing field='str' for short (non-Dict) CHAR and VARCHAR data types.

utils/common/collation.h

@@ -19,6 +19,7 @@
 #define COLLATION_H_INCLUDED
 
 #include "exceptclasses.h"
+#include "conststring.h"
 
 /*
   Redefine definitions used by MariaDB m_ctype.h.
@@ -92,9 +93,9 @@ public:
     MariaDBHasher()
         :mPart1(1), mPart2(4)
     { }
-    MariaDBHasher & add(CHARSET_INFO & cs, const char *str, size_t length)
+    MariaDBHasher & add(CHARSET_INFO * cs, const char *str, size_t length)
     {
-        cs.hash_sort((const uchar *) str, length, &mPart1, &mPart2);
+        cs->hash_sort((const uchar *) str, length, &mPart1, &mPart2);
         return *this;
     }
     uint32_t finalize() const
@@ -109,21 +110,33 @@ public:
 class Charset
 {
 protected:
-    const struct charset_info_st & mCharset;
+    const struct charset_info_st * mCharset;
 public:
-    Charset(CHARSET_INFO & cs) :mCharset(cs) { }
+    Charset(CHARSET_INFO & cs) :mCharset(&cs) { }
     Charset(uint32_t charsetNumber);
-    CHARSET_INFO & getCharset() const { return mCharset; }
+    CHARSET_INFO & getCharset() const { return *mCharset; }
     uint32_t hash(const char *data, uint64_t len) const
     {
         return MariaDBHasher().add(mCharset, data, len).finalize();
     }
     bool eq(const std::string & str1, const std::string & str2) const
     {
-        return mCharset.strnncollsp(str1.data(), str1.length(),
-                                    str2.data(), str2.length()) == 0;
+        return mCharset->strnncollsp(str1.data(), str1.length(),
+                                     str2.data(), str2.length()) == 0;
     }
+    int strnncollsp(const utils::ConstString &str1,
+                    const utils::ConstString &str2) const
+    {
+        return mCharset->strnncollsp(str1.str(), str1.length(),
+                                     str2.str(), str2.length());
+    }
+    bool test_if_important_data(const char *str, const char *end) const
+    {
+        if (mCharset->state & MY_CS_NOPAD)
+          return str < end;
+        return str + mCharset->scan(str, end, MY_SEQ_SPACES) < end;
 
+    }
 };
 
 

utils/common/conststring.h

@@ -0,0 +1,47 @@
+/* Copyright (C) 2020 MariaDB Corporation.
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License
+   as published by the Free Software Foundation; version 2 of
+   the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+   MA 02110-1301, USA. */
+
+
+#ifndef MARIADB_CONSTSTRING_H
+#define MARIADB_CONSTSTRING_H
+
+
+namespace utils
+{
+
+class ConstString
+{
+  const char *mStr;
+  size_t mLength;
+public:
+  ConstString(const char *str, size_t length)
+      :mStr(str), mLength(length)
+  { }
+  const char *str() const { return mStr; }
+  size_t length() const { return mLength; }
+  ConstString & rtrimZero()
+  {
+    for ( ; mLength && mStr[mLength - 1] == '\0'; mLength--)
+    { }
+    return *this;
+  }
+};
+
+
+} // namespace utils
+
+#endif // MARIADB_CONSTSTRING_H

utils/common/utils_utf8.cpp

@@ -31,7 +31,7 @@ static inline CHARSET_INFO & get_charset_or_bin(int32_t charsetNumber)
 
 
 Charset::Charset(uint32_t charsetNumber)
-   :mCharset(get_charset_or_bin(charsetNumber))
+   :mCharset(&get_charset_or_bin(charsetNumber))
 {
 }