MDEV-16912: Spider Order By column[datatime] limit 5 returns 3 rows

The problem occurs in 10.2 and earlier releases of MariaDB Server because the
Partition Engine was not pushing the engine conditions to the underlying
storage engine of each partition.  This caused Spider to return the first 5
rows in the table with the data provided by the customer.  2 of the 5 rows
did not qualify the WHERE clause, so they were removed from the result set by
the server.

To fix the problem, I have back-ported support for engine condition pushdown
in the Partition Engine from MariaDB Server 10.3.

Author:
  Jacob Mathew.

Reviewer:
  Kentoku Shiba.

Cherry-Picked:
  Commit eb2ca3d4 on branch bb-10.2-MDEV-16912

sql/ha_partition.cc

@@ -9131,6 +9131,56 @@ int ha_partition::check_for_upgrade(HA_CHECK_OPT *check_opt)
 }
 
 
+/**
+  Push an engine condition to the condition stack of the storage engine
+  for each partition.
+
+  @param  cond              Pointer to the engine condition to be pushed.
+
+  @return NULL              Underlying engine will not return rows that
+                            do not match the passed condition.
+          <> NULL           'Remainder' condition that the caller must use
+                            to filter out records.
+*/
+
+const COND *ha_partition::cond_push(const COND *cond)
+{
+  handler **file= m_file;
+  COND *res_cond= NULL;
+  DBUG_ENTER("ha_partition::cond_push");
+
+  do
+  {
+    if ((*file)->pushed_cond != cond)
+    {
+      if ((*file)->cond_push(cond))
+        res_cond= (COND *) cond;
+      else
+        (*file)->pushed_cond= cond;
+    }
+  } while (*(++file));
+  DBUG_RETURN(res_cond);
+}
+
+
+/**
+  Pop the top condition from the condition stack of the storage engine
+  for each partition.
+*/
+
+void ha_partition::cond_pop()
+{
+  handler **file= m_file;
+  DBUG_ENTER("ha_partition::cond_pop");
+
+  do
+  {
+    (*file)->cond_pop();
+  } while (*(++file));
+  DBUG_VOID_RETURN;
+}
+
+
 struct st_mysql_storage_engine partition_storage_engine=
 { MYSQL_HANDLERTON_INTERFACE_VERSION };
 

sql/ha_partition.h

@@ -1213,6 +1213,14 @@ class ha_partition :public handler
     virtual bool is_crashed() const;
     virtual int check_for_upgrade(HA_CHECK_OPT *check_opt);
 
+    /*
+      -----------------------------------------------------------------------
+      MODULE condition pushdown
+      -----------------------------------------------------------------------
+    */
+    virtual const COND *cond_push(const COND *cond);
+    virtual void cond_pop();
+
     private:
     int handle_opt_partitions(THD *thd, HA_CHECK_OPT *check_opt, uint flags);
     int handle_opt_part(THD *thd, HA_CHECK_OPT *check_opt, uint part_id,

storage/spider/mysql-test/spider/include/init_child2_1.inc

@@ -69,6 +69,20 @@ let $CHILD2_1_CREATE_TABLES6=
   ) $CHILD2_1_ENGINE $CHILD2_1_CHARSET;
 let $CHILD2_1_SELECT_TABLES6=
   SELECT a, b, date_format(c, '%Y-%m-%d %H:%i:%s') FROM ta_r_3 ORDER BY a;
+let $CHILD2_1_DROP_TABLES7=
+  DROP TABLE IF EXISTS ta_ob;
+let $CHILD2_1_CREATE_TABLES7=
+  CREATE TABLE ta_ob (
+    a VARCHAR(50) NOT NULL,
+    b VARCHAR(50) NULL DEFAULT NULL,
+    c VARCHAR(100) NULL DEFAULT NULL,
+    d DATETIME(0) NULL DEFAULT NULL,
+    e INT(11) NOT NULL,
+    f INT(10) NULL DEFAULT NULL,
+    PRIMARY KEY (a, e)
+  ) $CHILD2_1_ENGINE $CHILD2_1_CHARSET;
+let $CHILD2_1_SELECT_TABLES7=
+  SELECT * FROM ta_ob WHERE c LIKE "%510411106%" AND e = 510411 AND f != 1 ORDER BY d,c LIMIT 6 OFFSET 0;
 let $CHILD2_1_DROP_FT_TABLES=
   DROP TABLE IF EXISTS ft_r;
 let $CHILD2_1_CREATE_FT_TABLES=

storage/spider/mysql-test/spider/include/init_master_1.inc

@@ -94,6 +94,10 @@ if (!$VERSION_COMPILE_OS_WIN)
     CONNECTION='host "localhost", socket "$CHILD2_1_MYSOCK", user "root",
     password ""';
 }
+let $MASTER_1_COMMENT6_P_1_1=
+  COMMENT='database "auto_test_remote", table "ta_ob"'
+  PARTITION BY LIST COLUMNS (e) PARTITIONS 1
+  (PARTITION pt1 values in (510411) COMMENT = 'srv "s_2_1"');
 if ($VERSION_COMPILE_OS_WIN)
 {
   let $MASTER_1_COMMENT_FT_2_1=

storage/spider/mysql-test/spider/r/spider_fixes_part.result

@@ -197,6 +197,54 @@ id
 6216
 10000
 
+Test ORDER BY with LIMIT and OFFSET
+CREATE TABLE ta_ob (
+a VARCHAR(50) NOT NULL,
+b VARCHAR(50) NULL DEFAULT NULL,
+c VARCHAR(100) NULL DEFAULT NULL,
+d DATETIME(0) NULL DEFAULT NULL,
+e INT(11) NOT NULL,
+f INT(10) NULL DEFAULT NULL,
+PRIMARY KEY (a, e)
+) ENGINE=Spider COMMENT='database "auto_test_remote", table "ta_ob"'
+  PARTITION BY LIST COLUMNS (e) PARTITIONS 1
+(PARTITION pt1 values in (510411) COMMENT = 'srv "s_2_1"')
+INSERT INTO ta_ob VALUES ('0B95CD65DF994BC9A09A6AABE53A2733',
+'6CFED89FF6A84C7AA55C3C432663D094',
+'51041110620304', '2018-08-02 13:41:13',
+510411, 1);
+INSERT INTO ta_ob VALUES ('15E8D55EF099443BAEE639E60A4650BD',
+'879DC2A0B6AC46D9A62E8EA47E2970F2',
+'51041110620301', NULL,
+510411, 0);
+INSERT INTO ta_ob VALUES ('51ECF2C0CD3C48D99C91792E99D3C1A0',
+'017B8A460DBC444682B791305EF75356',
+'51041110620308', '2018-08-02 13:48:29',
+510411, 0);
+INSERT INTO ta_ob VALUES ('093B37A93A534DF883787AF5F6799674',
+'996C7F14989D480589A553717D735E3E',
+'51041110620302', '2018-08-02 13:48:30',
+510411, 0);
+INSERT INTO ta_ob VALUES ('53F5266FB069499AB6234755CACA2583',
+'017B8A460DBC444682B791305EF75356',
+'51041110620308', '2018-08-02 13:48:28',
+510411, 0);
+INSERT INTO ta_ob VALUES ('56E59BC4BDC143868D4A219C2D07A24B',
+'821E71E6ABB4404EBAA349BB681089F8',
+'51041110620310', '2018-08-02 13:48:27',
+510411, 0);
+INSERT INTO ta_ob VALUES ('56B68DA68D6D4A04A08B453D09AD7B70',
+'821E71E6ABB4404EBAA349BB681089F8',
+'51041110620310', '2018-08-02 13:48:28',
+510411, 0);
+SELECT * FROM ta_ob WHERE c LIKE "%510411106%" AND e = 510411 AND f != 1 ORDER BY d,c LIMIT 5 OFFSET 1;
+a	b	c	d	e	f
+56E59BC4BDC143868D4A219C2D07A24B	821E71E6ABB4404EBAA349BB681089F8	51041110620310	2018-08-02 13:48:27	510411	0
+53F5266FB069499AB6234755CACA2583	017B8A460DBC444682B791305EF75356	51041110620308	2018-08-02 13:48:28	510411	0
+56B68DA68D6D4A04A08B453D09AD7B70	821E71E6ABB4404EBAA349BB681089F8	51041110620310	2018-08-02 13:48:28	510411	0
+51ECF2C0CD3C48D99C91792E99D3C1A0	017B8A460DBC444682B791305EF75356	51041110620308	2018-08-02 13:48:29	510411	0
+093B37A93A534DF883787AF5F6799674	996C7F14989D480589A553717D735E3E	51041110620302	2018-08-02 13:48:30	510411	0
+
 deinit
 DROP DATABASE IF EXISTS auto_test_local;
 DROP DATABASE IF EXISTS auto_test_local;

storage/spider/mysql-test/spider/t/spider_fixes_part.test

@@ -616,6 +616,115 @@ if ($HAVE_PARTITION)
   }
 }
 
+--echo
+--echo Test ORDER BY with LIMIT and OFFSET
+if ($HAVE_PARTITION)
+{
+  if ($USE_CHILD_GROUP2)
+  {
+    if (!$OUTPUT_CHILD_GROUP2)
+    {
+      --disable_query_log
+      --disable_result_log
+    }
+    --connection child2_1
+    if ($OUTPUT_CHILD_GROUP2)
+    {
+      --disable_query_log
+      echo CHILD2_1_DROP_TABLES7;
+      echo CHILD2_1_CREATE_TABLES7;
+    }
+    --disable_warnings
+    eval $CHILD2_1_DROP_TABLES7;
+    --enable_warnings
+    eval $CHILD2_1_CREATE_TABLES7;
+    if ($OUTPUT_CHILD_GROUP2)
+    {
+      --enable_query_log
+    }
+    if ($USE_GENERAL_LOG)
+    {
+      TRUNCATE TABLE mysql.general_log;
+    }
+    if (!$OUTPUT_CHILD_GROUP2)
+    {
+      --enable_query_log
+      --enable_result_log
+    }
+  }
+  --connection master_1
+  --disable_query_log
+  --disable_warnings
+  DROP TABLE IF EXISTS ta_ob;
+  --enable_warnings
+  echo CREATE TABLE ta_ob (
+    a VARCHAR(50) NOT NULL,
+    b VARCHAR(50) NULL DEFAULT NULL,
+    c VARCHAR(100) NULL DEFAULT NULL,
+    d DATETIME(0) NULL DEFAULT NULL,
+    e INT(11) NOT NULL,
+    f INT(10) NULL DEFAULT NULL,
+    PRIMARY KEY (a, e)
+  ) $MASTER_1_ENGINE $MASTER_1_COMMENT6_P_1_1;
+  eval CREATE TABLE ta_ob (
+    a VARCHAR(50) NOT NULL,
+    b VARCHAR(50) NULL DEFAULT NULL,
+    c VARCHAR(100) NULL DEFAULT NULL,
+    d DATETIME(0) NULL DEFAULT NULL,
+    e INT(11) NOT NULL,
+    f INT(10) NULL DEFAULT NULL,
+    PRIMARY KEY (a, e)
+  ) $MASTER_1_ENGINE $MASTER_1_COMMENT6_P_1_1;
+  --enable_query_log
+  INSERT INTO ta_ob VALUES ('0B95CD65DF994BC9A09A6AABE53A2733',
+                            '6CFED89FF6A84C7AA55C3C432663D094',
+                            '51041110620304', '2018-08-02 13:41:13',
+                            510411, 1);
+  INSERT INTO ta_ob VALUES ('15E8D55EF099443BAEE639E60A4650BD',
+                            '879DC2A0B6AC46D9A62E8EA47E2970F2',
+                            '51041110620301', NULL,
+                            510411, 0);
+  INSERT INTO ta_ob VALUES ('51ECF2C0CD3C48D99C91792E99D3C1A0',
+                            '017B8A460DBC444682B791305EF75356',
+                            '51041110620308', '2018-08-02 13:48:29',
+                            510411, 0);
+  INSERT INTO ta_ob VALUES ('093B37A93A534DF883787AF5F6799674',
+                            '996C7F14989D480589A553717D735E3E',
+                            '51041110620302', '2018-08-02 13:48:30',
+                            510411, 0);
+  INSERT INTO ta_ob VALUES ('53F5266FB069499AB6234755CACA2583',
+                            '017B8A460DBC444682B791305EF75356',
+                            '51041110620308', '2018-08-02 13:48:28',
+                            510411, 0);
+  INSERT INTO ta_ob VALUES ('56E59BC4BDC143868D4A219C2D07A24B',
+                            '821E71E6ABB4404EBAA349BB681089F8',
+                            '51041110620310', '2018-08-02 13:48:27',
+                            510411, 0);
+  INSERT INTO ta_ob VALUES ('56B68DA68D6D4A04A08B453D09AD7B70',
+                            '821E71E6ABB4404EBAA349BB681089F8',
+                            '51041110620310', '2018-08-02 13:48:28',
+                            510411, 0);
+  SELECT * FROM ta_ob WHERE c LIKE "%510411106%" AND e = 510411 AND f != 1 ORDER BY d,c LIMIT 5 OFFSET 1;
+  if ($USE_CHILD_GROUP2)
+  {
+    if (!$OUTPUT_CHILD_GROUP2)
+    {
+      --disable_query_log
+      --disable_result_log
+    }
+    --connection child2_1
+    if ($USE_GENERAL_LOG)
+    {
+      SELECT argument FROM mysql.general_log WHERE argument LIKE '%select %';
+    }
+    eval $CHILD2_1_SELECT_TABLES7;
+    if (!$OUTPUT_CHILD_GROUP2)
+    {
+      --enable_query_log
+      --enable_result_log
+    }
+  }
+}
 
 --echo
 --echo deinit