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This commit is contained in:
Sergei Petrunia
2015-03-27 23:44:06 +03:00
parent 47c26d5aee
commit 9b8f86f895
2 changed files with 47 additions and 5 deletions
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35
sql/sql_select.cc
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@ -19084,7 +19084,15 @@ end_send(JOIN *join, JOIN_TAB *join_tab __attribute__((unused)),
}
/* ARGSUSED */
/*
@brief
Perform a GROUP BY operation over a stream of rows ordered by their group. The
result is sent into join->result.
@detail
Also applies HAVING, etc.
*/
enum_nested_loop_state
end_send_group(JOIN *join, JOIN_TAB *join_tab __attribute__((unused)),
bool end_of_records)
@ -19260,8 +19268,17 @@ end:
DBUG_RETURN(NESTED_LOOP_OK);
}
/* ARGSUSED */
/** Group by searching after group record and updating it if possible. */
/*
@brief
Perform a GROUP BY operation over rows coming in arbitrary order.
This is done by looking up the group in a temp.table and updating group
values.
@detail
Also applies HAVING, etc.
*/
static enum_nested_loop_state
end_update(JOIN *join, JOIN_TAB *join_tab __attribute__((unused)),
@ -19391,7 +19408,17 @@ end_unique_update(JOIN *join, JOIN_TAB *join_tab __attribute__((unused)),
}
/* ARGSUSED */
/*
@brief
Perform a GROUP BY operation over a stream of rows ordered by their group.
Write the result into a temporary table.
@detail
Also applies HAVING, etc.
The rows are written into temptable so e.g. filesort can read them.
*/
enum_nested_loop_state
end_write_group(JOIN *join, JOIN_TAB *join_tab __attribute__((unused)),
bool end_of_records)