Partial rollback of fix for bug #30059: End-space truncation is inconsistent

or incorrect.

For better conformance with standard, truncation procedure of CHAR columns
has been changed to ignore truncation of trailing whitespace characters
(note has been removed).

Finally, for columns with non-binary charsets:

1. CHAR(N) columns silently ignore trailing whitespace truncation;
2. VARCHAR and TEXT columns issue Note about truncation.

BLOBs and other columns with BINARY charset are unaffected.

mysql-test/r/bdb.result

@@ -1325,7 +1325,6 @@ set @a=repeat(' ',20);
 insert into t1 values (concat('+',@a),concat('+',@a),concat('+',@a));
 Warnings:
 Note	1265	Data truncated for column 'v' at row 1
-Note	1265	Data truncated for column 'c' at row 1
 select concat('*',v,'*',c,'*',t,'*') from t1;
 concat('*',v,'*',c,'*',t,'*')
 *+ *+*+ *

mysql-test/r/heap.result

@@ -256,7 +256,6 @@ set @a=repeat(' ',20);
 insert into t1 values (concat('+',@a),concat('+',@a),concat('+',@a));
 Warnings:
 Note	1265	Data truncated for column 'v' at row 1
-Note	1265	Data truncated for column 'c' at row 1
 select concat('*',v,'*',c,'*',t,'*') from t1;
 concat('*',v,'*',c,'*',t,'*')
 *+ *+*+ *

mysql-test/r/innodb.result

@@ -1901,7 +1901,6 @@ set @a=repeat(' ',20);
 insert into t1 values (concat('+',@a),concat('+',@a),concat('+',@a));
 Warnings:
 Note	1265	Data truncated for column 'v' at row 1
-Note	1265	Data truncated for column 'c' at row 1
 select concat('*',v,'*',c,'*',t,'*') from t1;
 concat('*',v,'*',c,'*',t,'*')
 *+ *+*+ *

mysql-test/r/myisam.result

@@ -1104,7 +1104,6 @@ set @a=repeat(' ',20);
 insert into t1 values (concat('+',@a),concat('+',@a),concat('+',@a));
 Warnings:
 Note	1265	Data truncated for column 'v' at row 1
-Note	1265	Data truncated for column 'c' at row 1
 select concat('*',v,'*',c,'*',t,'*') from t1;
 concat('*',v,'*',c,'*',t,'*')
 *+ *+*+ *

mysql-test/r/strict.result

@@ -934,8 +934,6 @@ NULL	NULL
 DROP TABLE t1;
 CREATE TABLE t1 (col1 CHAR(5), col2 VARCHAR(6));
 INSERT INTO t1 VALUES ('hello', 'hello'),('he', 'he'),('hello   ', 'hello ');
-Warnings:
-Note	1265	Data truncated for column 'col1' at row 3
 INSERT INTO t1 (col1) VALUES ('hellobob');
 ERROR 22001: Data too long for column 'col1' at row 1
 INSERT INTO t1 (col2) VALUES ('hellobob');

mysql-test/r/type_binary.result

@@ -125,7 +125,6 @@ create table t1 (c char(2), vc varchar(2));
 insert into t1 values(0x4120, 0x4120);
 insert into t1 values(0x412020, 0x412020);
 Warnings:
-Note	1265	Data truncated for column 'c' at row 1
 Note	1265	Data truncated for column 'vc' at row 1
 drop table t1;
 set @old_sql_mode= @@sql_mode, sql_mode= 'traditional';

mysql-test/r/warnings.result

@@ -305,7 +305,6 @@ set @q = repeat('q', 256);
 set sql_mode = '';
 insert into t1 values(@c, @c, @c);
 Warnings:
-Note	1265	Data truncated for column 'c_char' at row 1
 Note	1265	Data truncated for column 'c_varchar' at row 1
 Note	1265	Data truncated for column 'c_tinytext' at row 1
 insert into t2 values(@c);
@@ -322,7 +321,6 @@ Warning	1265	Data truncated for column 'c_tinyblob' at row 1
 set sql_mode = 'traditional';
 insert into t1 values(@c, @c, @c);
 Warnings:
-Note	1265	Data truncated for column 'c_char' at row 1
 Note	1265	Data truncated for column 'c_varchar' at row 1
 Note	1265	Data truncated for column 'c_tinytext' at row 1
 insert into t2 values(@c);

sql/field.cc

@@ -5868,6 +5868,7 @@ check_string_copy_error(Field_str *field,
     Field_longstr::report_if_important_data()
     ptr                      - Truncated rest of string
     end                      - End of truncated string
+    count_spaces             - Treat traling spaces as important data
 
   RETURN VALUES
     0   - None was truncated (or we don't count cut fields)
@@ -5877,10 +5878,12 @@ check_string_copy_error(Field_str *field,
     Check if we lost any important data (anything in a binary string,
     or any non-space in others). If only trailing spaces was lost,
     send a truncation note, otherwise send a truncation error.
+    Silently ignore traling spaces if the count_space parameter is FALSE.
 */
 
 int
-Field_longstr::report_if_important_data(const char *ptr, const char *end)
+Field_longstr::report_if_important_data(const char *ptr, const char *end,
+                                        bool count_spaces)
 {
   if ((ptr < end) && table->in_use->count_cuted_fields)
   {
@@ -5890,10 +5893,13 @@ Field_longstr::report_if_important_data(const char *ptr, const char *end)
         set_warning(MYSQL_ERROR::WARN_LEVEL_ERROR, ER_DATA_TOO_LONG, 1);
       else
         set_warning(MYSQL_ERROR::WARN_LEVEL_WARN, WARN_DATA_TRUNCATED, 1);
+      return 2;
     }
-    else /* If we lost only spaces then produce a NOTE, not a WARNING */
+    else if (count_spaces)
+    { /* If we lost only spaces then produce a NOTE, not a WARNING */
       set_warning(MYSQL_ERROR::WARN_LEVEL_NOTE, WARN_DATA_TRUNCATED, 1);
-    return 2;
+      return 2;
+    }
   }
   return 0;
 }
@@ -5929,7 +5935,7 @@ int Field_string::store(const char *from,uint length,CHARSET_INFO *cs)
                               cannot_convert_error_pos, from + length))
     return 2;
 
-  return report_if_important_data(from_end_pos, from + length);
+  return report_if_important_data(from_end_pos, from + length, FALSE);
 }
 
 
@@ -6388,7 +6394,7 @@ int Field_varstring::store(const char *from,uint length,CHARSET_INFO *cs)
                               cannot_convert_error_pos, from + length))
     return 2;
 
-  return report_if_important_data(from_end_pos, from + length);
+  return report_if_important_data(from_end_pos, from + length, TRUE);
 }
 
 
@@ -7025,7 +7031,7 @@ int Field_blob::store(const char *from,uint length,CHARSET_INFO *cs)
                               cannot_convert_error_pos, from + length))
     return 2;
 
-  return report_if_important_data(from_end_pos, from + length);
+  return report_if_important_data(from_end_pos, from + length, TRUE);
 
 oom_error:
   /* Fatal OOM error */

sql/field.h

@@ -455,7 +455,8 @@ public:
 class Field_longstr :public Field_str
 {
 protected:
-  int report_if_important_data(const char *ptr, const char *end);
+  int report_if_important_data(const char *ptr, const char *end,
+                               bool count_spaces);
 public:
   Field_longstr(char *ptr_arg, uint32 len_arg, uchar *null_ptr_arg,
                 uchar null_bit_arg, utype unireg_check_arg,