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#include "mariadb.h"
#include "sql_priv.h"
#include "sql_select.h"
#include "select_handler.h"
Pushdown_select::Pushdown_select(SELECT_LEX *sel, select_handler *h)
: select(sel), handler(h)
{
is_analyze= handler->thd->lex->analyze_stmt;
}
Pushdown_select::~Pushdown_select()
{
delete handler;
select->select_h= NULL;
}
bool Pushdown_select::init()
{
List<Item> types;
TMP_TABLE_PARAM tmp_table_param;
THD *thd= handler->thd;
DBUG_ENTER("Pushdown_select::init");
if (select->master_unit()->join_union_item_types(thd, types, 1))
DBUG_RETURN(true);
tmp_table_param.init();
tmp_table_param.field_count= types.elements;
handler->table= create_tmp_table(thd, &tmp_table_param, types,
(ORDER *) 0, false, 0,
TMP_TABLE_ALL_COLUMNS, 1,
&empty_clex_str, true, false);
if (!handler->table)
DBUG_RETURN(true);
if (handler->table->fill_item_list(&result_columns))
DBUG_RETURN(true);
DBUG_RETURN(false);
}
bool Pushdown_select::send_result_set_metadata()
{
THD *thd= handler->thd;
Protocol *protocol= thd->protocol;
DBUG_ENTER("Pushdown_select::send_result_set_metadata");
#ifdef WITH_WSREP
if (WSREP(thd) && thd->wsrep_retry_query)
{
WSREP_DEBUG("skipping select metadata");
DBUG_RETURN(false);
}
#endif /* WITH_WSREP */
if (protocol->send_result_set_metadata(&result_columns,
Protocol::SEND_NUM_ROWS |
Protocol::SEND_EOF))
DBUG_RETURN(true);
DBUG_RETURN(false);
}
bool Pushdown_select::send_data()
{
THD *thd= handler->thd;
Protocol *protocol= thd->protocol;
DBUG_ENTER("Pushdown_select::send_data");
if (thd->killed == ABORT_QUERY)
DBUG_RETURN(false);
protocol->prepare_for_resend();
if (protocol->send_result_set_row(&result_columns))
{
protocol->remove_last_row();
DBUG_RETURN(true);
}
thd->inc_sent_row_count(1);
if (thd->vio_ok())
DBUG_RETURN(protocol->write());
DBUG_RETURN(false);
}
bool Pushdown_select::send_eof()
{
THD *thd= handler->thd;
DBUG_ENTER("Pushdown_select::send_eof");
/*
Don't send EOF if we're in error condition (which implies we've already
sent or are sending an error)
*/
if (thd->is_error())
DBUG_RETURN(true);
::my_eof(thd);
DBUG_RETURN(false);
}
int Pushdown_select::execute()
{
int err;
THD *thd= handler->thd;
DBUG_ENTER("Pushdown_select::execute");
if ((err= handler->init_scan()))
goto error;
if (is_analyze)
{
handler->end_scan();
DBUG_RETURN(0);
}
if (send_result_set_metadata())
DBUG_RETURN(-1);
while (!(err= handler->next_row()))
{
if (thd->check_killed() || send_data())
{
handler->end_scan();
DBUG_RETURN(-1);
}
}
if (err != 0 && err != HA_ERR_END_OF_FILE)
goto error;
if ((err= handler->end_scan()))
goto error_2;
if (send_eof())
DBUG_RETURN(-1);
DBUG_RETURN(0);
error:
handler->end_scan();
error_2:
handler->print_error(err, MYF(0));
DBUG_RETURN(-1); // Error not sent to client
}
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