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-rw-r--r--storage/innobase/eval/eval0eval.cc632
-rw-r--r--storage/innobase/eval/eval0proc.cc286
2 files changed, 918 insertions, 0 deletions
diff --git a/storage/innobase/eval/eval0eval.cc b/storage/innobase/eval/eval0eval.cc
new file mode 100644
index 00000000..193a5814
--- /dev/null
+++ b/storage/innobase/eval/eval0eval.cc
@@ -0,0 +1,632 @@
+/*****************************************************************************
+
+Copyright (c) 1997, 2016, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 2019, MariaDB Corporation.
+
+This program is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free Software
+Foundation; version 2 of the License.
+
+This program is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
+
+*****************************************************************************/
+
+/**************************************************//**
+@file eval/eval0eval.cc
+SQL evaluator: evaluates simple data structures, like expressions, in
+a query graph
+
+Created 12/29/1997 Heikki Tuuri
+*******************************************************/
+
+#include "eval0eval.h"
+#include "data0data.h"
+#include "row0sel.h"
+#include "rem0cmp.h"
+
+/** Dummy adress used when we should allocate a buffer of size 0 in
+eval_node_alloc_val_buf */
+
+static byte eval_dummy;
+
+/*************************************************************************
+Gets the like node from the node */
+UNIV_INLINE
+que_node_t*
+que_node_get_like_node(
+/*===================*/
+ /* out: next node in a list of nodes */
+ que_node_t* node) /* in: node in a list */
+{
+ return(((sym_node_t*) node)->like_node);
+}
+
+/*****************************************************************//**
+Allocate a buffer from global dynamic memory for a value of a que_node.
+NOTE that this memory must be explicitly freed when the query graph is
+freed. If the node already has an allocated buffer, that buffer is freed
+here. NOTE that this is the only function where dynamic memory should be
+allocated for a query node val field.
+@return pointer to allocated buffer */
+byte*
+eval_node_alloc_val_buf(
+/*====================*/
+ que_node_t* node, /*!< in: query graph node; sets the val field
+ data field to point to the new buffer, and
+ len field equal to size */
+ ulint size) /*!< in: buffer size */
+{
+ dfield_t* dfield;
+ byte* data;
+
+ ut_ad(que_node_get_type(node) == QUE_NODE_SYMBOL
+ || que_node_get_type(node) == QUE_NODE_FUNC);
+
+ dfield = que_node_get_val(node);
+
+ data = static_cast<byte*>(dfield_get_data(dfield));
+
+ if (data != &eval_dummy) {
+ ut_free(data);
+ }
+
+ if (size == 0) {
+ data = &eval_dummy;
+ } else {
+ data = static_cast<byte*>(ut_malloc_nokey(size));
+ }
+
+ que_node_set_val_buf_size(node, size);
+
+ dfield_set_data(dfield, data, size);
+
+ return(data);
+}
+
+/*****************************************************************//**
+Free the buffer from global dynamic memory for a value of a que_node,
+if it has been allocated in the above function. The freeing for pushed
+column values is done in sel_col_prefetch_buf_free. */
+void
+eval_node_free_val_buf(
+/*===================*/
+ que_node_t* node) /*!< in: query graph node */
+{
+ dfield_t* dfield;
+ byte* data;
+
+ ut_ad(que_node_get_type(node) == QUE_NODE_SYMBOL
+ || que_node_get_type(node) == QUE_NODE_FUNC);
+
+ dfield = que_node_get_val(node);
+
+ data = static_cast<byte*>(dfield_get_data(dfield));
+
+ if (que_node_get_val_buf_size(node) > 0) {
+ ut_a(data);
+
+ ut_free(data);
+ }
+}
+
+/*********************************************************************
+Evaluates a LIKE comparison node.
+@return the result of the comparison */
+UNIV_INLINE
+ibool
+eval_cmp_like(
+/*==========*/
+ que_node_t* arg1, /* !< in: left operand */
+ que_node_t* arg2) /* !< in: right operand */
+{
+ ib_like_t op;
+ que_node_t* arg3;
+ que_node_t* arg4;
+ const dfield_t* dfield;
+
+ arg3 = que_node_get_like_node(arg2);
+
+ /* Get the comparison type operator */
+ ut_a(arg3);
+
+ dfield = que_node_get_val(arg3);
+ ut_ad(dtype_get_mtype(dfield_get_type(dfield)) == DATA_INT);
+ op = static_cast<ib_like_t>(
+ mach_read_from_4(static_cast<const byte*>(
+ dfield_get_data(dfield))));
+
+ switch (op) {
+ case IB_LIKE_PREFIX:
+ arg4 = que_node_get_next(arg3);
+ return(!cmp_dfield_dfield_like_prefix(que_node_get_val(arg1),
+ que_node_get_val(arg4)));
+ case IB_LIKE_EXACT:
+ return(!cmp_dfield_dfield(que_node_get_val(arg1),
+ que_node_get_val(arg2)));
+ }
+
+ ut_error;
+ return(FALSE);
+}
+
+/*********************************************************************
+Evaluates a comparison node.
+@return the result of the comparison */
+ibool
+eval_cmp(
+/*=====*/
+ func_node_t* cmp_node) /*!< in: comparison node */
+{
+ que_node_t* arg1;
+ que_node_t* arg2;
+ int res;
+ ibool val = FALSE; /* remove warning */
+
+ ut_ad(que_node_get_type(cmp_node) == QUE_NODE_FUNC);
+
+ arg1 = cmp_node->args;
+ arg2 = que_node_get_next(arg1);
+
+ switch (cmp_node->func) {
+ case '<':
+ case '=':
+ case '>':
+ case PARS_LE_TOKEN:
+ case PARS_NE_TOKEN:
+ case PARS_GE_TOKEN:
+ res = cmp_dfield_dfield(
+ que_node_get_val(arg1), que_node_get_val(arg2));
+
+ switch (cmp_node->func) {
+ case '<':
+ val = (res < 0);
+ break;
+ case '=':
+ val = (res == 0);
+ break;
+ case '>':
+ val = (res > 0);
+ break;
+ case PARS_LE_TOKEN:
+ val = (res <= 0);
+ break;
+ case PARS_NE_TOKEN:
+ val = (res != 0);
+ break;
+ case PARS_GE_TOKEN:
+ val = (res >= 0);
+ break;
+ }
+ break;
+ default:
+ val = eval_cmp_like(arg1, arg2);
+ break;
+ }
+
+ eval_node_set_ibool_val(cmp_node, val);
+
+ return(val);
+}
+
+/*****************************************************************//**
+Evaluates a logical operation node. */
+UNIV_INLINE
+void
+eval_logical(
+/*=========*/
+ func_node_t* logical_node) /*!< in: logical operation node */
+{
+ que_node_t* arg1;
+ que_node_t* arg2;
+ ibool val1;
+ ibool val2 = 0; /* remove warning */
+ ibool val = 0; /* remove warning */
+ int func;
+
+ ut_ad(que_node_get_type(logical_node) == QUE_NODE_FUNC);
+
+ arg1 = logical_node->args;
+ arg2 = que_node_get_next(arg1); /* arg2 is NULL if func is 'NOT' */
+
+ val1 = eval_node_get_ibool_val(arg1);
+
+ if (arg2) {
+ val2 = eval_node_get_ibool_val(arg2);
+ }
+
+ func = logical_node->func;
+
+ if (func == PARS_AND_TOKEN) {
+ val = val1 & val2;
+ } else if (func == PARS_OR_TOKEN) {
+ val = val1 | val2;
+ } else if (func == PARS_NOT_TOKEN) {
+ val = TRUE - val1;
+ } else {
+ ut_error;
+ }
+
+ eval_node_set_ibool_val(logical_node, val);
+}
+
+/*****************************************************************//**
+Evaluates an arithmetic operation node. */
+UNIV_INLINE
+void
+eval_arith(
+/*=======*/
+ func_node_t* arith_node) /*!< in: arithmetic operation node */
+{
+ que_node_t* arg1;
+ que_node_t* arg2;
+ lint val1;
+ lint val2 = 0; /* remove warning */
+ lint val;
+ int func;
+
+ ut_ad(que_node_get_type(arith_node) == QUE_NODE_FUNC);
+
+ arg1 = arith_node->args;
+ arg2 = que_node_get_next(arg1); /* arg2 is NULL if func is unary '-' */
+
+ val1 = eval_node_get_int_val(arg1);
+
+ if (arg2) {
+ val2 = eval_node_get_int_val(arg2);
+ }
+
+ func = arith_node->func;
+
+ if (func == '+') {
+ val = val1 + val2;
+ } else if ((func == '-') && arg2) {
+ val = val1 - val2;
+ } else if (func == '-') {
+ val = -val1;
+ } else if (func == '*') {
+ val = val1 * val2;
+ } else {
+ ut_ad(func == '/');
+ val = val1 / val2;
+ }
+
+ eval_node_set_int_val(arith_node, val);
+}
+
+/*****************************************************************//**
+Evaluates an aggregate operation node. */
+UNIV_INLINE
+void
+eval_aggregate(
+/*===========*/
+ func_node_t* node) /*!< in: aggregate operation node */
+{
+ lint val;
+
+ ut_ad(que_node_get_type(node) == QUE_NODE_FUNC);
+
+ val = eval_node_get_int_val(node);
+
+ ut_a(node->func == PARS_COUNT_TOKEN);
+ val = val + 1;
+ eval_node_set_int_val(node, val);
+}
+
+/*****************************************************************//**
+Evaluates a notfound-function node. */
+UNIV_INLINE
+void
+eval_notfound(
+/*==========*/
+ func_node_t* func_node) /*!< in: function node */
+{
+ sym_node_t* cursor;
+ sel_node_t* sel_node;
+ ibool ibool_val;
+
+ ut_ad(func_node->func == PARS_NOTFOUND_TOKEN);
+
+ cursor = static_cast<sym_node_t*>(func_node->args);
+
+ ut_ad(que_node_get_type(cursor) == QUE_NODE_SYMBOL);
+
+ if (cursor->token_type == SYM_LIT) {
+ ut_ad(!memcmp(dfield_get_data(que_node_get_val(cursor)),
+ "SQL", 3));
+ sel_node = cursor->sym_table->query_graph->last_sel_node;
+ } else {
+ sel_node = cursor->alias->cursor_def;
+ }
+
+ if (sel_node->state == SEL_NODE_NO_MORE_ROWS) {
+ ibool_val = TRUE;
+ } else {
+ ibool_val = FALSE;
+ }
+
+ eval_node_set_ibool_val(func_node, ibool_val);
+}
+
+/*****************************************************************//**
+Evaluates a substr-function node. */
+UNIV_INLINE
+void
+eval_substr(
+/*========*/
+ func_node_t* func_node) /*!< in: function node */
+{
+ que_node_t* arg1;
+ que_node_t* arg2;
+ que_node_t* arg3;
+ dfield_t* dfield;
+ byte* str1;
+ ulint len1;
+ ulint len2;
+
+ arg1 = func_node->args;
+ arg2 = que_node_get_next(arg1);
+
+ ut_ad(func_node->func == PARS_SUBSTR_TOKEN);
+
+ arg3 = que_node_get_next(arg2);
+
+ str1 = static_cast<byte*>(dfield_get_data(que_node_get_val(arg1)));
+
+ len1 = (ulint) eval_node_get_int_val(arg2);
+ len2 = (ulint) eval_node_get_int_val(arg3);
+
+ dfield = que_node_get_val(func_node);
+
+ dfield_set_data(dfield, str1 + len1, len2);
+}
+
+/*****************************************************************//**
+Evaluates an instr-function node. */
+static
+void
+eval_instr(
+/*=======*/
+ func_node_t* func_node) /*!< in: function node */
+{
+ que_node_t* arg1;
+ que_node_t* arg2;
+ dfield_t* dfield1;
+ dfield_t* dfield2;
+ lint int_val;
+ byte* str1;
+ byte* str2;
+ byte match_char;
+ ulint len1;
+ ulint len2;
+ ulint i;
+ ulint j;
+
+ arg1 = func_node->args;
+ arg2 = que_node_get_next(arg1);
+
+ dfield1 = que_node_get_val(arg1);
+ dfield2 = que_node_get_val(arg2);
+
+ str1 = static_cast<byte*>(dfield_get_data(dfield1));
+ str2 = static_cast<byte*>(dfield_get_data(dfield2));
+
+ len1 = dfield_get_len(dfield1);
+ len2 = dfield_get_len(dfield2);
+
+ if (len2 == 0) {
+ ut_error;
+ }
+
+ match_char = str2[0];
+
+ for (i = 0; i < len1; i++) {
+ /* In this outer loop, the number of matched characters is 0 */
+
+ if (str1[i] == match_char) {
+
+ if (i + len2 > len1) {
+
+ break;
+ }
+
+ for (j = 1;; j++) {
+ /* We have already matched j characters */
+
+ if (j == len2) {
+ int_val = lint(i) + 1;
+
+ goto match_found;
+ }
+
+ if (str1[i + j] != str2[j]) {
+
+ break;
+ }
+ }
+ }
+ }
+
+ int_val = 0;
+
+match_found:
+ eval_node_set_int_val(func_node, int_val);
+}
+
+/*****************************************************************//**
+Evaluates a predefined function node. */
+static
+void
+eval_concat(
+/*========*/
+ func_node_t* func_node) /*!< in: function node */
+{
+ que_node_t* arg;
+ dfield_t* dfield;
+ byte* data;
+ ulint len;
+ ulint len1;
+
+ arg = func_node->args;
+ len = 0;
+
+ while (arg) {
+ len1 = dfield_get_len(que_node_get_val(arg));
+
+ len += len1;
+
+ arg = que_node_get_next(arg);
+ }
+
+ data = eval_node_ensure_val_buf(func_node, len);
+
+ arg = func_node->args;
+ len = 0;
+
+ while (arg) {
+ dfield = que_node_get_val(arg);
+ len1 = dfield_get_len(dfield);
+
+ memcpy(data + len, dfield_get_data(dfield), len1);
+
+ len += len1;
+
+ arg = que_node_get_next(arg);
+ }
+}
+
+/*****************************************************************//**
+Evaluates a predefined function node. If the first argument is an integer,
+this function looks at the second argument which is the integer length in
+bytes, and converts the integer to a VARCHAR.
+If the first argument is of some other type, this function converts it to
+BINARY. */
+UNIV_INLINE
+void
+eval_to_binary(
+/*===========*/
+ func_node_t* func_node) /*!< in: function node */
+{
+ que_node_t* arg1;
+ que_node_t* arg2;
+ dfield_t* dfield;
+ byte* str1;
+ ulint len;
+ ulint len1;
+
+ arg1 = func_node->args;
+
+ str1 = static_cast<byte*>(dfield_get_data(que_node_get_val(arg1)));
+
+ if (dtype_get_mtype(que_node_get_data_type(arg1)) != DATA_INT) {
+
+ len = dfield_get_len(que_node_get_val(arg1));
+
+ dfield = que_node_get_val(func_node);
+
+ dfield_set_data(dfield, str1, len);
+
+ return;
+ }
+
+ arg2 = que_node_get_next(arg1);
+
+ len1 = (ulint) eval_node_get_int_val(arg2);
+
+ if (len1 > 4) {
+
+ ut_error;
+ }
+
+ dfield = que_node_get_val(func_node);
+
+ dfield_set_data(dfield, str1 + (4 - len1), len1);
+}
+
+/*****************************************************************//**
+Evaluate LENGTH(). */
+inline void eval_length(func_node_t* func_node)
+{
+ eval_node_set_int_val(func_node,
+ dfield_get_len(que_node_get_val
+ (func_node->args)));
+}
+
+/*****************************************************************//**
+Evaluates a function node. */
+void
+eval_func(
+/*======*/
+ func_node_t* func_node) /*!< in: function node */
+{
+ que_node_t* arg;
+ ulint fclass;
+
+ ut_ad(que_node_get_type(func_node) == QUE_NODE_FUNC);
+
+ fclass = func_node->fclass;
+ const int func = func_node->func;
+
+ arg = func_node->args;
+
+ /* Evaluate first the argument list */
+ while (arg) {
+ eval_exp(arg);
+
+ /* The functions are not defined for SQL null argument
+ values, except for eval_cmp and notfound */
+
+ if (dfield_is_null(que_node_get_val(arg))
+ && (fclass != PARS_FUNC_CMP)
+ && (func != PARS_NOTFOUND_TOKEN)) {
+ ut_error;
+ }
+
+ arg = que_node_get_next(arg);
+ }
+
+ switch (fclass) {
+ case PARS_FUNC_CMP:
+ eval_cmp(func_node);
+ return;
+ case PARS_FUNC_ARITH:
+ eval_arith(func_node);
+ return;
+ case PARS_FUNC_AGGREGATE:
+ eval_aggregate(func_node);
+ return;
+ case PARS_FUNC_PREDEFINED:
+ switch (func) {
+ case PARS_NOTFOUND_TOKEN:
+ eval_notfound(func_node);
+ return;
+ case PARS_SUBSTR_TOKEN:
+ eval_substr(func_node);
+ return;
+ case PARS_INSTR_TOKEN:
+ eval_instr(func_node);
+ return;
+ case PARS_CONCAT_TOKEN:
+ eval_concat(func_node);
+ return;
+ case PARS_TO_BINARY_TOKEN:
+ eval_to_binary(func_node);
+ return;
+ case PARS_LENGTH_TOKEN:
+ eval_length(func_node);
+ return;
+ default:
+ ut_error;
+ }
+ case PARS_FUNC_LOGICAL:
+ eval_logical(func_node);
+ return;
+ }
+
+ ut_error;
+}
diff --git a/storage/innobase/eval/eval0proc.cc b/storage/innobase/eval/eval0proc.cc
new file mode 100644
index 00000000..7e39443f
--- /dev/null
+++ b/storage/innobase/eval/eval0proc.cc
@@ -0,0 +1,286 @@
+/*****************************************************************************
+
+Copyright (c) 1998, 2016, Oracle and/or its affiliates. All Rights Reserved.
+
+This program is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free Software
+Foundation; version 2 of the License.
+
+This program is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
+
+*****************************************************************************/
+
+/**************************************************//**
+@file eval/eval0proc.cc
+Executes SQL stored procedures and their control structures
+
+Created 1/20/1998 Heikki Tuuri
+*******************************************************/
+
+#include "eval0proc.h"
+
+/**********************************************************************//**
+Performs an execution step of an if-statement node.
+@return query thread to run next or NULL */
+que_thr_t*
+if_step(
+/*====*/
+ que_thr_t* thr) /*!< in: query thread */
+{
+ if_node_t* node;
+ elsif_node_t* elsif_node;
+
+ ut_ad(thr);
+
+ node = static_cast<if_node_t*>(thr->run_node);
+ ut_ad(que_node_get_type(node) == QUE_NODE_IF);
+
+ if (thr->prev_node == que_node_get_parent(node)) {
+
+ /* Evaluate the condition */
+
+ eval_exp(node->cond);
+
+ if (eval_node_get_ibool_val(node->cond)) {
+
+ /* The condition evaluated to TRUE: start execution
+ from the first statement in the statement list */
+
+ thr->run_node = node->stat_list;
+
+ } else if (node->else_part) {
+ thr->run_node = node->else_part;
+
+ } else if (node->elsif_list) {
+ elsif_node = node->elsif_list;
+
+ for (;;) {
+ eval_exp(elsif_node->cond);
+
+ if (eval_node_get_ibool_val(
+ elsif_node->cond)) {
+
+ /* The condition evaluated to TRUE:
+ start execution from the first
+ statement in the statement list */
+
+ thr->run_node = elsif_node->stat_list;
+
+ break;
+ }
+
+ elsif_node = static_cast<elsif_node_t*>(
+ que_node_get_next(elsif_node));
+
+ if (elsif_node == NULL) {
+ thr->run_node = NULL;
+
+ break;
+ }
+ }
+ } else {
+ thr->run_node = NULL;
+ }
+ } else {
+ /* Move to the next statement */
+ ut_ad(que_node_get_next(thr->prev_node) == NULL);
+
+ thr->run_node = NULL;
+ }
+
+ if (thr->run_node == NULL) {
+ thr->run_node = que_node_get_parent(node);
+ }
+
+ return(thr);
+}
+
+/**********************************************************************//**
+Performs an execution step of a while-statement node.
+@return query thread to run next or NULL */
+que_thr_t*
+while_step(
+/*=======*/
+ que_thr_t* thr) /*!< in: query thread */
+{
+ while_node_t* node;
+
+ ut_ad(thr);
+
+ node = static_cast<while_node_t*>(thr->run_node);
+ ut_ad(que_node_get_type(node) == QUE_NODE_WHILE);
+
+ ut_ad((thr->prev_node == que_node_get_parent(node))
+ || (que_node_get_next(thr->prev_node) == NULL));
+
+ /* Evaluate the condition */
+
+ eval_exp(node->cond);
+
+ if (eval_node_get_ibool_val(node->cond)) {
+
+ /* The condition evaluated to TRUE: start execution
+ from the first statement in the statement list */
+
+ thr->run_node = node->stat_list;
+ } else {
+ thr->run_node = que_node_get_parent(node);
+ }
+
+ return(thr);
+}
+
+/**********************************************************************//**
+Performs an execution step of an assignment statement node.
+@return query thread to run next or NULL */
+que_thr_t*
+assign_step(
+/*========*/
+ que_thr_t* thr) /*!< in: query thread */
+{
+ assign_node_t* node;
+
+ ut_ad(thr);
+
+ node = static_cast<assign_node_t*>(thr->run_node);
+ ut_ad(que_node_get_type(node) == QUE_NODE_ASSIGNMENT);
+
+ /* Evaluate the value to assign */
+
+ eval_exp(node->val);
+
+ eval_node_copy_val(node->var->alias, node->val);
+
+ thr->run_node = que_node_get_parent(node);
+
+ return(thr);
+}
+
+/**********************************************************************//**
+Performs an execution step of a for-loop node.
+@return query thread to run next or NULL */
+que_thr_t*
+for_step(
+/*=====*/
+ que_thr_t* thr) /*!< in: query thread */
+{
+ for_node_t* node;
+ que_node_t* parent;
+ lint loop_var_value;
+
+ ut_ad(thr);
+
+ node = static_cast<for_node_t*>(thr->run_node);
+
+ ut_ad(que_node_get_type(node) == QUE_NODE_FOR);
+
+ parent = que_node_get_parent(node);
+
+ if (thr->prev_node != parent) {
+
+ /* Move to the next statement */
+ thr->run_node = que_node_get_next(thr->prev_node);
+
+ if (thr->run_node != NULL) {
+
+ return(thr);
+ }
+
+ /* Increment the value of loop_var */
+
+ loop_var_value = 1 + eval_node_get_int_val(node->loop_var);
+ } else {
+ /* Initialize the loop */
+
+ eval_exp(node->loop_start_limit);
+ eval_exp(node->loop_end_limit);
+
+ loop_var_value = eval_node_get_int_val(node->loop_start_limit);
+
+ node->loop_end_value
+ = (int) eval_node_get_int_val(node->loop_end_limit);
+ }
+
+ /* Check if we should do another loop */
+
+ if (loop_var_value > node->loop_end_value) {
+
+ /* Enough loops done */
+
+ thr->run_node = parent;
+ } else {
+ eval_node_set_int_val(node->loop_var, loop_var_value);
+
+ thr->run_node = node->stat_list;
+ }
+
+ return(thr);
+}
+
+/**********************************************************************//**
+Performs an execution step of an exit statement node.
+@return query thread to run next or NULL */
+que_thr_t*
+exit_step(
+/*======*/
+ que_thr_t* thr) /*!< in: query thread */
+{
+ exit_node_t* node;
+ que_node_t* loop_node;
+
+ ut_ad(thr);
+
+ node = static_cast<exit_node_t*>(thr->run_node);
+
+ ut_ad(que_node_get_type(node) == QUE_NODE_EXIT);
+
+ /* Loops exit by setting thr->run_node as the loop node's parent, so
+ find our containing loop node and get its parent. */
+
+ loop_node = que_node_get_containing_loop_node(node);
+
+ /* If someone uses an EXIT statement outside of a loop, this will
+ trigger. */
+ ut_a(loop_node);
+
+ thr->run_node = que_node_get_parent(loop_node);
+
+ return(thr);
+}
+
+/**********************************************************************//**
+Performs an execution step of a return-statement node.
+@return query thread to run next or NULL */
+que_thr_t*
+return_step(
+/*========*/
+ que_thr_t* thr) /*!< in: query thread */
+{
+ return_node_t* node;
+ que_node_t* parent;
+
+ ut_ad(thr);
+
+ node = static_cast<return_node_t*>(thr->run_node);
+
+ ut_ad(que_node_get_type(node) == QUE_NODE_RETURN);
+
+ parent = node;
+
+ while (que_node_get_type(parent) != QUE_NODE_PROC) {
+
+ parent = que_node_get_parent(parent);
+ }
+
+ ut_a(parent);
+
+ thr->run_node = que_node_get_parent(parent);
+
+ return(thr);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-13 08:28:20 +0000