bk commit into 5.1 tree (antony:1.2574) BUG#31473

[antony]

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ChangeSet@stripped, 2007-10-16 13:37:16-07:00, antony@stripped +3 -0
  Bug#31473
    "CSV does not work with NULL value in datetime fields"
    Attempting to insert a row with a NULL value for a DATETIME field
    results in a CSV file which the storage engine cannot read.
    Don't blindly assume that "0" is acceptable for all field types,
    Since CSV does not support NULL, we find out from the field the
    default non-null value.

  mysql-test/r/csv.result@stripped, 2007-10-16 13:37:07-07:00, antony@stripped +6 -0
    test for bug 31473

  mysql-test/t/csv.test@stripped, 2007-10-16 13:37:07-07:00, antony@stripped +8 -0
    test for bug 31473

  storage/csv/ha_tina.cc@stripped, 2007-10-16 13:37:07-07:00, antony@stripped +7 -3
    bug31473
      Don't blindly assume that "0" is acceptable for all field types,
      Since CSV does not support NULL, we find out from the field the
      default non-null value.

diff -Nrup a/mysql-test/r/csv.result b/mysql-test/r/csv.result
--- a/mysql-test/r/csv.result	2007-07-10 01:09:05 -07:00
+++ b/mysql-test/r/csv.result	2007-10-16 13:37:07 -07:00
@@ -5315,4 +5315,10 @@ test.t1	check	status	OK
 select * from t1;
 a
 drop table t1;
+create table t1(a datetime default null) engine=csv;
+insert into t1 values();
+select * from t1;
+a
+0000-00-00 00:00:00
+drop table t1;
 End of 5.1 tests
diff -Nrup a/mysql-test/t/csv.test b/mysql-test/t/csv.test
--- a/mysql-test/t/csv.test	2007-08-08 07:39:12 -07:00
+++ b/mysql-test/t/csv.test	2007-10-16 13:37:07 -07:00
@@ -1727,4 +1727,12 @@ check table t1;
 select * from t1;
 drop table t1;
 
+#
+# Bug #31473: does not work with NULL value in datetime field
+#
+create table t1(a datetime default null) engine=csv;
+insert into t1 values();
+select * from t1;
+drop table t1;
+
 --echo End of 5.1 tests
diff -Nrup a/storage/csv/ha_tina.cc b/storage/csv/ha_tina.cc
--- a/storage/csv/ha_tina.cc	2007-08-13 06:11:15 -07:00
+++ b/storage/csv/ha_tina.cc	2007-10-16 13:37:07 -07:00
@@ -471,6 +471,7 @@ int ha_tina::encode_quote(uchar *buf)
   {
     const char *ptr;
     const char *end_ptr;
+    const bool was_null= (*field)->is_null();
 
     /*
       CSV does not support nulls. Write quoted 0 to the buffer. In fact,
@@ -480,13 +481,16 @@ int ha_tina::encode_quote(uchar *buf)
       field content is cleaned up every time we use Field::set_null()
       in the code.
     */
-    if ((*field)->is_null())
+    if (was_null)
     {
-      buffer.append(STRING_WITH_LEN("\"0\","));
-      continue;
+      (*field)->set_default();
+      (*field)->set_notnull();
     }
 
     (*field)->val_str(&attribute,&attribute);
+
+    if (was_null)
+      (*field)->set_null();
 
     if ((*field)->str_needs_quotes())
     {