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by brian
clean slate |
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/******************************************************
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Select
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(c) 1997 Innobase Oy
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Created 12/19/1997 Heikki Tuuri
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*******************************************************/
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#include "que0que.h" |
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/*************************************************************************
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Gets the plan node for the nth table in a join. */
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UNIV_INLINE
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plan_t* |
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sel_node_get_nth_plan( |
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/*==================*/
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/* out: plan node */
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sel_node_t* node, /* in: select node */ |
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ulint i) /* in: get ith plan node */ |
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{
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ut_ad(i < node->n_tables); |
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return(node->plans + i); |
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}
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/*************************************************************************
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Resets the cursor defined by sel_node to the SEL_NODE_OPEN state, which means
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that it will start fetching from the start of the result set again, regardless
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of where it was before, and it will set intention locks on the tables. */
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UNIV_INLINE
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void
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sel_node_reset_cursor( |
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/*==================*/
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sel_node_t* node) /* in: select node */ |
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{
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node->state = SEL_NODE_OPEN; |
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}
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/**************************************************************************
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Performs an execution step of an open or close cursor statement node. */
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UNIV_INLINE
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que_thr_t* |
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open_step( |
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/*======*/
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/* out: query thread to run next or NULL */
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que_thr_t* thr) /* in: query thread */ |
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{
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sel_node_t* sel_node; |
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open_node_t* node; |
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ulint err; |
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ut_ad(thr); |
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node = thr->run_node; |
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ut_ad(que_node_get_type(node) == QUE_NODE_OPEN); |
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sel_node = node->cursor_def; |
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err = DB_SUCCESS; |
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if (node->op_type == ROW_SEL_OPEN_CURSOR) { |
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/* if (sel_node->state == SEL_NODE_CLOSED) { */
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sel_node_reset_cursor(sel_node); |
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/* } else {
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err = DB_ERROR;
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} */
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} else { |
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if (sel_node->state != SEL_NODE_CLOSED) { |
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sel_node->state = SEL_NODE_CLOSED; |
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} else { |
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err = DB_ERROR; |
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}
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}
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if (UNIV_EXPECT(err, DB_SUCCESS) != DB_SUCCESS) { |
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/* SQL error detected */
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fprintf(stderr, "SQL error %lu\n", (ulong) err); |
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ut_error; |
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}
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thr->run_node = que_node_get_parent(node); |
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return(thr); |
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}
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