Bug#39893: Crash if select on a partitioned table, when partitioning is disabled

Problem was that it tried to run partitioning function calls when
opening a partitioned table, when it was explicitly disabled.

Solution is to check if the partitioning plugin is ready to use before
using any partitioning specific calls.

mysql-test/r/disabled_partition.require:
  Bug#39893: Crash if select on a partitioned table, when partitioning is disabled
  
  New require file to use when partitioning is disabled (but compiled in)
mysql-test/r/not_partition.result:
  Bug#39893: Crash if select on a partitioned table, when partitioning is disabled
  
  Updated testcase
mysql-test/r/partition_disabled.result:
  Bug#39893: Crash if select on a partitioned table, when partitioning is disabled
  
  New result file
mysql-test/std_data/parts/t1.frm:
  Bug#39893: Crash if select on a partitioned table, when partitioning is disabled
  
  frm file for 'create table t1 (a int) partition by hash (a)'
mysql-test/t/not_partition.test:
  Bug#39893: Crash if select on a partitioned table, when partitioning is disabled
  
  Updated test cases
mysql-test/t/partition_disabled-master.opt:
  Bug#39893: Crash if select on a partitioned table, when partitioning is disabled
  
  New opt file
mysql-test/t/partition_disabled.test:
  Bug#39893: Crash if select on a partitioned table, when partitioning is disabled
  
  New test file (looks like not_partition.test, but with different errors)
sql/sql_yacc.yy:
  Bug#39893: Crash if select on a partitioned table, when partitioning is disabled
  
  Better error message (it is already built with partitioning, but is explicitly
  disabled).
sql/table.cc:
  Bug#39893: Crash if select on a partitioned table, when partitioning is disabled
  
  If the partitioning plugin is not ready, fail to open the table.

1 files changed, 85 insertions, 0 deletions

diff --git a/mysql-test/t/partition_disabled.test b/mysql-test/t/partition_disabled.test
new file mode 100644
index 00000000000..2f068b8c3cc
--- /dev/null
+++ b/mysql-test/t/partition_disabled.test
@@ -0,0 +1,85 @@
+--disable_abort_on_error
+# Run this test only when mysqld has partitioning, but it is disabled.
+# The statements are not expected to work, just check that we
+# can't crash the server.
+--require r/disabled_partition.require
+--disable_query_log
+show variables like "have_partitioning";
+--enable_query_log
+--disable_warnings
+DROP TABLE IF EXISTS t1;
+--enable_warnings
+let $MYSQLD_DATADIR= `SELECT @@datadir`;
+
+#
+# Bug#39893: Crash if select on a partitioned table,
+#            when partitioning is disabled
+FLUSH TABLES;
+--copy_file $MYSQLTEST_VARDIR/std_data_ln/parts/t1.frm $MYSQLD_DATADIR/test/t1.frm
+SELECT * FROM t1;
+TRUNCATE TABLE t1;
+ANALYZE TABLE t1;
+CHECK TABLE t1;
+OPTIMIZE TABLE t1;
+REPAIR TABLE t1;
+ALTER TABLE t1 REPAIR PARTITION ALL;
+ALTER TABLE t1 CHECK PARTITION ALL;
+ALTER TABLE t1 OPTIMIZE PARTITION ALL;
+ALTER TABLE t1 ANALYZE PARTITION ALL;
+ALTER TABLE t1 REBUILD PARTITION ALL;
+ALTER TABLE t1 ENGINE Memory;
+ALTER TABLE t1 ADD (new INT);
+DROP TABLE t1;
+
+--error ER_OPTION_PREVENTS_STATEMENT
+CREATE TABLE t1 (
+    firstname VARCHAR(25) NOT NULL,
+    lastname VARCHAR(25) NOT NULL,
+    username VARCHAR(16) NOT NULL,
+    email VARCHAR(35),
+    joined DATE NOT NULL
+)
+PARTITION BY KEY(joined)
+PARTITIONS 6;
+
+--error ER_OPTION_PREVENTS_STATEMENT
+ALTER TABLE t1 PARTITION BY KEY(joined) PARTITIONS 2;
+
+--error ER_BAD_TABLE_ERROR
+drop table t1;
+
+--error ER_OPTION_PREVENTS_STATEMENT
+CREATE TABLE t1 (
+    firstname VARCHAR(25) NOT NULL,
+    lastname VARCHAR(25) NOT NULL,
+    username VARCHAR(16) NOT NULL,
+    email VARCHAR(35),
+    joined DATE NOT NULL
+)
+PARTITION BY RANGE( YEAR(joined) ) (
+    PARTITION p0 VALUES LESS THAN (1960),
+    PARTITION p1 VALUES LESS THAN (1970),
+    PARTITION p2 VALUES LESS THAN (1980),
+    PARTITION p3 VALUES LESS THAN (1990),
+    PARTITION p4 VALUES LESS THAN MAXVALUE
+);
+--error ER_BAD_TABLE_ERROR
+drop table t1;
+
+--error ER_OPTION_PREVENTS_STATEMENT
+CREATE TABLE t1 (id INT, purchased DATE)
+    PARTITION BY RANGE( YEAR(purchased) )
+    SUBPARTITION BY HASH( TO_DAYS(purchased) )
+    SUBPARTITIONS 2 (
+        PARTITION p0 VALUES LESS THAN (1990),
+        PARTITION p1 VALUES LESS THAN (2000),
+        PARTITION p2 VALUES LESS THAN MAXVALUE
+    );
+--error ER_BAD_TABLE_ERROR
+drop table t1;
+
+# Create a table without partitions to test "EXPLAIN PARTITIONS"
+create table t1 (a varchar(10) charset latin1 collate latin1_bin);
+insert into t1 values (''),(' '),('a'),('a '),('a  ');
+explain partitions select * from t1 where a='a ' OR a='a';
+drop table t1;