Backporting Bug#37129 LDML lacks <i> rule

mysql-test/std_data/Index.xml

 <charsets>
 
   <charset name="utf8">
+    <collation name="utf8_phone_ci" id="352">
+      <rules>
+        <reset>\u0000</reset>
+          <i>\u0020</i> <!-- space -->
+          <i>\u0028</i> <!-- left parenthesis -->
+          <i>\u0029</i> <!-- right parenthesis -->
+          <i>\u002B</i> <!-- plus -->
+          <i>\u002D</i> <!-- hyphen -->
+      </rules>
+    </collation>
     <collation name="utf8_test_ci" id="353">
       <rules>
         <reset>a</reset>
-        <s>b</s>
+        <i>b</i>
       </rules>
     </collation>
 

mysql-test/t/ctype_ldml.test

@@ -4,11 +4,30 @@
 drop table if exists t1;
 --enable_warnings
 
+--echo In the following tests we change the order of letter "b"
+--echo making it equal to letter "a", and check that it works
+--echo with all Unicode character sets
 set names utf8;
 
 --replace_result $MYSQL_TEST_DIR MYSQL_TEST_DIR
 show variables like 'character_sets_dir%';
 
+show collation like 'utf8_phone_ci';
+CREATE TABLE t1 (
+ name VARCHAR(64),
+ phone VARCHAR(64) CHARACTER SET utf8 COLLATE utf8_phone_ci
+);
+INSERT INTO t1 VALUES ('Svoj','+7 912 800 80 02');
+INSERT INTO t1 VALUES ('Hf','+7 (912) 800 80 04');
+INSERT INTO t1 VALUES ('Bar','+7-912-800-80-01');
+INSERT INTO t1 VALUES ('Ramil','(7912) 800 80 03');
+INSERT INTO t1 VALUES ('Sanja','+380 (912) 8008005');
+SELECT * FROM t1 ORDER BY phone;
+SELECT * FROM t1 WHERE phone='+7(912)800-80-01';
+SELECT * FROM t1 WHERE phone='79128008001';
+SELECT * FROM t1 WHERE phone='7 9 1 2 8 0 0 8 0 0 1';
+DROP TABLE t1;
+
 show collation like 'utf8_test_ci';
 create table t1 (c1 char(1) character set utf8 collate utf8_test_ci);
 insert into t1 values ('a');

strings/ctype-uca.c

@@ -7661,6 +7661,13 @@ static my_coll_lexem_num my_coll_lexem_next(MY_COLL_LEXEM *lexem)
       goto ex;
     }
     
+    if (beg[0] == '=')
+    {
+      beg++;
+      rc= MY_COLL_LEXEM_DIFF;
+      goto ex;
+    }
+    
     if (beg[0] == '<')
     {
       for (beg++, lexem->diff= 1;
@@ -7821,6 +7828,10 @@ static int my_coll_rule_parse(MY_COLL_RULE *rule, size_t mitems,
           item.diff[1]= 0;
           item.diff[2]= 0;
         }
+        else if (lexem.diff == 0)
+        {
+          item.diff[0]= item.diff[1]= item.diff[2]= 0;
+        }
         if (nitems >= mitems)
         {
           my_coll_lexem_print_error(&lexem,errstr,errsize-1,"Too many rules");

strings/ctype.c

@@ -74,6 +74,7 @@ struct my_cs_file_section_st
 #define	_CS_DIFF1	19
 #define	_CS_DIFF2	20
 #define	_CS_DIFF3	21
+#define	_CS_IDENTICAL	22
 
 
 static struct my_cs_file_section_st sec[] =
@@ -108,6 +109,7 @@ static struct my_cs_file_section_st sec[] =
   {_CS_DIFF1,		"charsets/charset/collation/rules/p"},
   {_CS_DIFF2,		"charsets/charset/collation/rules/s"},
   {_CS_DIFF3,		"charsets/charset/collation/rules/t"},
+  {_CS_IDENTICAL,	"charsets/charset/collation/rules/i"},
   {0,	NULL}
 };
 
@@ -269,6 +271,7 @@ static int cs_value(MY_XML_PARSER *st,const char *attr, size_t len)
   case _CS_DIFF1:
   case _CS_DIFF2:
   case _CS_DIFF3:
+  case _CS_IDENTICAL:
     {
       /*
         Convert collation description from
@@ -276,7 +279,7 @@ static int cs_value(MY_XML_PARSER *st,const char *attr, size_t len)
         into ICU Collation Customization expression.
       */
       char arg[16];
-      const char *cmd[]= {"&","<","<<","<<<"};
+      const char *cmd[]= {"&","<","<<","<<<","="};
       i->cs.tailoring= i->tailoring;
       mstr(arg,attr,len,sizeof(arg)-1);
       if (i->tailoring_length + 20 < sizeof(i->tailoring))