Bug#18908: ERROR 1406 (22001): Data too long for column :: using utf8

Problem: Too confusing error message when cannot convert
between string and column character sets on INSERT and UPDATE.
Fix: producing a better error message, instead of "Data too long"
in such cases
Additional changes: Adding "DROP TABLE IF EXISTS" into several
tests to be safe against failures in previous tests. 


mysql-test/include/strict_autoinc.inc:
  Adding DROP TABLE to be safe against previous tests failure.
mysql-test/r/ctype_recoding.result:
  Fixing test results
mysql-test/r/ctype_utf8.result:
  Fixing test results
mysql-test/r/fulltext.result:
  Fixing test results
mysql-test/r/strict_autoinc_1myisam.result:
  Adding DROP TABLE to be safe against previous tests failure.
mysql-test/r/strict_autoinc_2innodb.result:
  Adding DROP TABLE to be safe against previous tests failure.
mysql-test/r/strict_autoinc_3heap.result:
  Adding DROP TABLE to be safe against previous tests failure.
mysql-test/r/strict_autoinc_4bdb.result:
  Adding DROP TABLE to be safe against previous tests failure.
mysql-test/r/strict_autoinc_5ndb.result:
  Adding DROP TABLE to be safe against previous tests failure.
sql/field.cc:
  - producing better error messages than
    "DATA TRUNCATED" or "DATA TOO LONG" (in strict mode)
    in case of "not well formed source" and
    "cannot convert to field character set"
  - Performance improvements: copying directly to
    the target, instead of using an intermediate
    String.
  - Moving duplicate code into report_data_too_long() function.
sql/sql_string.cc:
  Adding a new function to convert strings between character sets,
  but not more than "nchar" characters - a helper function for
  Field_string::store(), Field_varstring::store() and Field_blob::store().
sql/sql_string.h:
  Adding new function prototype.

8 files changed, 14 insertions, 9 deletions

diff --git a/mysql-test/r/ctype_recoding.result b/mysql-test/r/ctype_recoding.result
index 4e145346081..125e0edd1f9 100644
--- a/mysql-test/r/ctype_recoding.result
+++ b/mysql-test/r/ctype_recoding.result
@@ -171,8 +171,8 @@ create table t1 (a char(10) character set koi8r, b text character set koi8r);
 insert into t1 values ('test','test');
 insert into t1 values ('ÊÃÕË','ÊÃÕË');
 Warnings:
-Warning	1265	Data truncated for column 'a' at row 1
-Warning	1265	Data truncated for column 'b' at row 1
+Warning	1366	Incorrect string value: '\xCA\xC3\xD5\xCB' for column 'a' at row 1
+Warning	1366	Incorrect string value: '\xCA\xC3\xD5\xCB' for column 'b' at row 1
 drop table t1;
 set names koi8r;
 create table t1 (a char(10) character set cp1251);
diff --git a/mysql-test/r/ctype_utf8.result b/mysql-test/r/ctype_utf8.result
index 51f361349e6..a0b6d233a5c 100644
--- a/mysql-test/r/ctype_utf8.result
+++ b/mysql-test/r/ctype_utf8.result
@@ -197,7 +197,7 @@ drop table t1;
 create table t1 (s1 char(10) character set utf8);
 insert into t1 values (0x41FF);
 Warnings:
-Warning	1265	Data truncated for column 's1' at row 1
+Warning	1366	Incorrect string value: '\xFF' for column 's1' at row 1
 select hex(s1) from t1;
 hex(s1)
 41
@@ -205,7 +205,7 @@ drop table t1;
 create table t1 (s1 varchar(10) character set utf8);
 insert into t1 values (0x41FF);
 Warnings:
-Warning	1265	Data truncated for column 's1' at row 1
+Warning	1366	Incorrect string value: '\xFF' for column 's1' at row 1
 select hex(s1) from t1;
 hex(s1)
 41
@@ -213,7 +213,7 @@ drop table t1;
 create table t1 (s1 text character set utf8);
 insert into t1 values (0x41FF);
 Warnings:
-Warning	1265	Data truncated for column 's1' at row 1
+Warning	1366	Incorrect string value: '\xFF' for column 's1' at row 1
 select hex(s1) from t1;
 hex(s1)
 41
diff --git a/mysql-test/r/fulltext.result b/mysql-test/r/fulltext.result
index 85894d5cb0e..7c9069791fa 100644
--- a/mysql-test/r/fulltext.result
+++ b/mysql-test/r/fulltext.result
@@ -372,10 +372,10 @@ t	collation(t)	FORMAT(MATCH t AGAINST ('Osnabruck'),6)
 aus Osnabrück	utf8_general_ci	1.591140
 alter table t1 modify t varchar(200) collate latin1_german2_ci not null;
 Warnings:
-Warning	1265	Data truncated for column 't' at row 3
-Warning	1265	Data truncated for column 't' at row 4
-Warning	1265	Data truncated for column 't' at row 5
-Warning	1265	Data truncated for column 't' at row 6
+Warning	1366	Incorrect string value: '\xD0\xAD\xD1\x82\xD0\xBE...' for column 't' at row 3
+Warning	1366	Incorrect string value: '\xD0\x9E\xD1\x82\xD0\xBB...' for column 't' at row 4
+Warning	1366	Incorrect string value: '\xD0\x9D\xD0\xB5 \xD0...' for column 't' at row 5
+Warning	1366	Incorrect string value: '\xD0\xB8 \xD0\xB1\xD1...' for column 't' at row 6
 SELECT t, collation(t) FROM t1 WHERE MATCH t AGAINST ('Osnabrück');
 t	collation(t)
 aus Osnabrück	latin1_german2_ci
diff --git a/mysql-test/r/strict_autoinc_1myisam.result b/mysql-test/r/strict_autoinc_1myisam.result
index 5d3c2698cda..90a69bedc74 100644
--- a/mysql-test/r/strict_autoinc_1myisam.result
+++ b/mysql-test/r/strict_autoinc_1myisam.result
@@ -1,3 +1,4 @@
+drop table if exists t1;
 set @org_mode=@@sql_mode;
 create table t1
 (
diff --git a/mysql-test/r/strict_autoinc_2innodb.result b/mysql-test/r/strict_autoinc_2innodb.result
index f1936ff4de3..8a5243173e4 100644
--- a/mysql-test/r/strict_autoinc_2innodb.result
+++ b/mysql-test/r/strict_autoinc_2innodb.result
@@ -1,3 +1,4 @@
+drop table if exists t1;
 set @org_mode=@@sql_mode;
 create table t1
 (
diff --git a/mysql-test/r/strict_autoinc_3heap.result b/mysql-test/r/strict_autoinc_3heap.result
index aa0be270ac5..7dc48357c46 100644
--- a/mysql-test/r/strict_autoinc_3heap.result
+++ b/mysql-test/r/strict_autoinc_3heap.result
@@ -1,3 +1,4 @@
+drop table if exists t1;
 set @org_mode=@@sql_mode;
 create table t1
 (
diff --git a/mysql-test/r/strict_autoinc_4bdb.result b/mysql-test/r/strict_autoinc_4bdb.result
index 73683b645e2..89c4d2537f5 100644
--- a/mysql-test/r/strict_autoinc_4bdb.result
+++ b/mysql-test/r/strict_autoinc_4bdb.result
@@ -1,3 +1,4 @@
+drop table if exists t1;
 set @org_mode=@@sql_mode;
 create table t1
 (
diff --git a/mysql-test/r/strict_autoinc_5ndb.result b/mysql-test/r/strict_autoinc_5ndb.result
index d0d62d05b32..715f9a4b98b 100644
--- a/mysql-test/r/strict_autoinc_5ndb.result
+++ b/mysql-test/r/strict_autoinc_5ndb.result
@@ -1,3 +1,4 @@
+drop table if exists t1;
 set @org_mode=@@sql_mode;
 create table t1
 (