Bug#18888 Trying to overwrite sql/lex_hash.h during build

- As a sideeffect of the patch to generate lex_hash.h only once
on the machine where the source dist was produced, a problem
was found when compiling a mysqld without partition support - it 
would crash when looking up the lex symbols due to mismatch between
lex.h and the generated lex_hash.h

 - Remove the ifdef for partition in lex.h 
 - Fix minor problem with"EXPLAIN PARTITION" when not compiled with
   partition(existed also without the above patch)
 - Add test case that will be run when we don't have partition
   support compiled into mysqld
 - Return error ER_FEATURE_DISABLED if user tries to use PARTITION
   when there is no support for it.


sql/lex.h:
  There should be no ifdefs of features in lex.h
sql/sql_class.cc:
  In line with the comment in sql_yacc.yy that we want the same output
  from "EXPLAIN PARTITIONS.." regardless of wheter we have compiled in
  support for partition  or not, remove the ifdef so the extra field
  is added to output if the DESCRIBE_PARTITIONS bit it set. Without
  this patch we get a crash as the code in select_describe believes the
  field is there.
sql/sql_select.cc:
  Use "const" for the variable as it's a ssigned once and never changes
sql/sql_yacc.yy:
  Don't allow PARTITION syntax oif there is no suport for partitioning
mysql-test/r/not_partition.require:
  New BitKeeper file ``mysql-test/r/not_partition.require''
mysql-test/r/not_partition.result:
  New BitKeeper file ``mysql-test/r/not_partition.result''
mysql-test/t/not_partition.test:
  New BitKeeper file ``mysql-test/t/not_partition.test''

mysql-test/r/not_partition.require

@@ -0,0 +1,2 @@
+Variable_name	Value
+have_partitioning	NO

mysql-test/r/not_partition.result

@@ -0,0 +1,48 @@
+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 HY000: The 'partitioning' feature is disabled; you need MySQL built with '--with-partition' to have it working
+ALTER TABLE t1 PARTITION BY KEY(joined) PARTITIONS 2;
+ERROR HY000: The 'partitioning' feature is disabled; you need MySQL built with '--with-partition' to have it working
+drop table t1;
+ERROR 42S02: Unknown table 't1'
+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 HY000: The 'partitioning' feature is disabled; you need MySQL built with '--with-partition' to have it working
+drop table t1;
+ERROR 42S02: Unknown table 't1'
+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 HY000: The 'partitioning' feature is disabled; you need MySQL built with '--with-partition' to have it working
+drop table t1;
+ERROR 42S02: Unknown table 't1'
+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';
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	NULL	ALL	NULL	NULL	NULL	NULL	5	Using where
+drop table t1;

mysql-test/t/not_partition.test

@@ -0,0 +1,62 @@
+--disable_abort_on_error
+# Run this tets only when mysqld don't has partitioning
+# the statements are not expected to work, just check that we
+# can't crash the server
+-- require r/not_partition.require
+disable_query_log;
+show variables like "have_partitioning";
+enable_query_log;
+
+
+--error ER_FEATURE_DISABLED
+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_FEATURE_DISABLED
+ALTER TABLE t1 PARTITION BY KEY(joined) PARTITIONS 2;
+
+--error ER_BAD_TABLE_ERROR
+drop table t1;
+
+--error ER_FEATURE_DISABLED
+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_FEATURE_DISABLED
+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;

sql/lex.h

@@ -45,6 +45,10 @@ SYM_GROUP sym_group_rtree= {"RTree keys", "HAVE_RTREE_KEYS"};
   Symbols are broken into separated arrays to allow field names with
   same name as functions.
   These are kept sorted for human lookup (the symbols are hashed).
+
+  NOTE! The symbol tables should be the same regardless of what features
+  are compiled into the server. Don't add ifdef'ed symbols to the
+  lists
 */
 
 static SYMBOL symbols[] = {
@@ -383,11 +387,9 @@ static SYMBOL symbols[] = {
   { "PACK_KEYS",	SYM(PACK_KEYS_SYM)},
   { "PARSER",           SYM(PARSER_SYM)},
   { "PARTIAL",		SYM(PARTIAL)},
-#ifdef WITH_PARTITION_STORAGE_ENGINE
   { "PARTITION",        SYM(PARTITION_SYM)},
   { "PARTITIONING",     SYM(PARTITIONING_SYM)},
   { "PARTITIONS",       SYM(PARTITIONS_SYM)},
-#endif
   { "PASSWORD",		SYM(PASSWORD)},
   { "PHASE",            SYM(PHASE_SYM)},
   { "PLUGIN",           SYM(PLUGIN_SYM)},

sql/sql_class.cc

@@ -859,7 +859,6 @@ int THD::send_explain_fields(select_result *result)
   field_list.push_back(new Item_empty_string("select_type", 19, cs));
   field_list.push_back(item= new Item_empty_string("table", NAME_LEN, cs));
   item->maybe_null= 1;
-#ifdef WITH_PARTITION_STORAGE_ENGINE
   if (lex->describe & DESCRIBE_PARTITIONS)
   {
     /* Maximum length of string that make_used_partitions_str() can produce */
@@ -868,7 +867,6 @@ int THD::send_explain_fields(select_result *result)
     field_list.push_back(item);
     item->maybe_null= 1;
   }
-#endif
   field_list.push_back(item= new Item_empty_string("type", 10, cs));
   item->maybe_null= 1;
   field_list.push_back(item=new Item_empty_string("possible_keys",

sql/sql_select.cc

@@ -2200,7 +2200,7 @@ make_join_statistics(JOIN *join, TABLE_LIST *tables, COND *conds,
       continue;
     }
 #ifdef WITH_PARTITION_STORAGE_ENGINE
-    bool no_partitions_used= table->no_partitions_used;
+    const bool no_partitions_used= table->no_partitions_used;
 #else
     const bool no_partitions_used= FALSE;
 #endif

sql/sql_yacc.yy

@@ -3225,6 +3225,7 @@ opt_partitioning:
 partitioning:
         PARTITION_SYM
         {
+#ifdef WITH_PARTITION_STORAGE_ENGINE
           LEX *lex= Lex;
           lex->part_info= new partition_info();
           if (!lex->part_info)
@@ -3236,6 +3237,12 @@ partitioning:
           {
             lex->alter_info.flags|= ALTER_PARTITION;
           }
+#else
+          my_error(ER_FEATURE_DISABLED, MYF(0),
+       	           "partitioning", "--with-partition");
+          YYABORT;
+#endif
+
         }
         partition
         ;