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5.3 merge

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This commit is contained in:
Sergei Golubchik
2014-09-12 16:51:41 +02:00
parent 32360bb728 5023bb899d
commit c799d65baf
11 changed files with 560 additions and 11 deletions
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47
sql/table.cc
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@@ -5994,6 +5994,52 @@ void TABLE::create_key_part_by_field(KEY *keyinfo,
}
/**
@brief
Check validity of a possible key for the derived table
@param key the number of the key
@param key_parts number of components of the key
@param next_field_no the call-back function that returns the number of
the field used as the next component of the key
@param arg the argument for the above function
@details
The function checks whether a possible key satisfies the constraints
imposed on the keys of any temporary table.
@return TRUE if the key is valid
@return FALSE otherwise
*/
bool TABLE::check_tmp_key(uint key, uint key_parts,
uint (*next_field_no) (uchar *), uchar *arg)
{
Field **reg_field;
uint i;
uint key_len= 0;
for (i= 0; i < key_parts; i++)
{
uint fld_idx= next_field_no(arg);
reg_field= field + fld_idx;
uint fld_store_len= (uint16) (*reg_field)->key_length();
if ((*reg_field)->real_maybe_null())
fld_store_len+= HA_KEY_NULL_LENGTH;
if ((*reg_field)->type() == MYSQL_TYPE_BLOB ||
(*reg_field)->real_type() == MYSQL_TYPE_VARCHAR ||
(*reg_field)->type() == MYSQL_TYPE_GEOMETRY)
fld_store_len+= HA_KEY_BLOB_LENGTH;
key_len+= fld_store_len;
}
/*
We use MI_MAX_KEY_LENGTH (myisam's default) below because it is
smaller than MAX_KEY_LENGTH (heap's default) and it's unknown whether
myisam or heap will be used for the temporary table.
*/
return key_len <= MI_MAX_KEY_LENGTH;
}
/**
@brief
Add one key to a temporary table
@@ -6025,6 +6071,7 @@ bool TABLE::add_tmp_key(uint key, uint key_parts,
KEY* keyinfo;
Field **reg_field;
uint i;
bool key_start= TRUE;
KEY_PART_INFO* key_part_info=
(KEY_PART_INFO*) alloc_root(&mem_root, sizeof(KEY_PART_INFO)*key_parts);