Fixed bug #29442.

The SELECT INTO OUTFILE FIELDS ENCLOSED BY digit or minus sign,
followed by the same LOAD DATA INFILE statement, used wrond encoding
of non-string fields contained the enclosed character in their text
representation.

Example:
  SELECT 15, 9 INTO OUTFILE 'text' FIELDS ENCLOSED BY '5';

Old encoded result in the text file:
  5155 595
         ^ was decoded as the 1st enclosing character of the 2nd field;
        ^ was skipped as garbage;
  ^    ^ was decoded as a pair of englosing characters of the 1st field;
      ^   was decoded as traling space of the first field;
    ^^ was decoded as a doubled enclosed character.

New encoded result in the text file:
  51\55 595
  ^   ^ pair of enclosing characters of the 1st field;
    ^^ escaped enclosed character.

1 files changed, 14 insertions, 0 deletions

diff --git a/mysql-test/r/loaddata.result b/mysql-test/r/loaddata.result
index 031aa5c700c..7fff2700779 100644
--- a/mysql-test/r/loaddata.result
+++ b/mysql-test/r/loaddata.result
@@ -238,3 +238,17 @@ f1
 1
 2
 drop table t1,t2;
+CREATE TABLE t1 (c1 INT, c2 TIMESTAMP, c3 REAL, c4 DOUBLE);
+INSERT INTO t1 (c1, c2, c3, c4) VALUES (10, '1970-02-01 01:02:03', 1.1E-100, 1.1E+100);
+SELECT * FROM t1;
+c1	c2	c3	c4
+10	1970-02-01 01:02:03	1.1e-100	1.1e+100
+SELECT * INTO OUTFILE 'MYSQLTEST_VARDIR/tmp/t1' FIELDS ENCLOSED BY '-' FROM t1;
+-10-	-1970\-02\-01 01:02:03-	-1.1e\-100-	-1.1e+100-
+EOF
+TRUNCATE t1;
+LOAD DATA INFILE 'MYSQLTEST_VARDIR/tmp/t1' INTO TABLE t1 FIELDS ENCLOSED BY '-';
+SELECT * FROM t1;
+c1	c2	c3	c4
+10	1970-02-01 01:02:03	1.1e-100	1.1e+100
+DROP TABLE t1;