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Parser, SQL: (0.4) TRANSACTION support in queries

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Syntax extension: TIMESTAMP/TRANSACTION keyword can be used before FROM ... TO, BETWEEN ... AND.
Example:
    SELECT * FROM t1 FOR SYSTEM_TIME TIMESTAMP FROM '1-1-1' TO NOW();

Closes #27
This commit is contained in:
Aleksey Midenkov
2016-10-14 13:25:28 +00:00
parent a22cbc453f
commit 6d89a4a49b
6 changed files with 101 additions and 31 deletions
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36
sql/sql_select.cc
View File

@ -668,7 +668,7 @@ setup_without_group(THD *thd, Ref_ptr_array ref_pointer_array,
}
static int
setup_for_system_time(THD *thd, TABLE_LIST *tables, COND **where_expr, SELECT_LEX *select_lex)
setup_for_system_time(THD *thd, TABLE_LIST *tables, COND **where_expr, SELECT_LEX *slex)
{
DBUG_ENTER("setup_for_system_time");
@ -698,11 +698,11 @@ setup_for_system_time(THD *thd, TABLE_LIST *tables, COND **where_expr, SELECT_LE
because they must outlive execution phase for multiple executions. */
arena= thd->activate_stmt_arena_if_needed(&backup);
if (select_lex->saved_where)
if (slex->saved_where)
{
DBUG_ASSERT(thd->stmt_arena->is_sp_execute());
/* 2. this copy_andor_structure() is also required by the same reason */
*where_expr= select_lex->saved_where->copy_andor_structure(thd);
*where_expr= slex->saved_where->copy_andor_structure(thd);
}
else if (thd->stmt_arena->is_sp_execute())
{
@ -711,7 +711,7 @@ setup_for_system_time(THD *thd, TABLE_LIST *tables, COND **where_expr, SELECT_LE
else if (*where_expr) // SP executed first time (STMT_INITIALIZED_FOR_SP)
/* 1. copy_andor_structure() is required since this andor tree
is modified later (and on shorter arena) */
select_lex->saved_where= (*where_expr)->copy_andor_structure(thd);
slex->saved_where= (*where_expr)->copy_andor_structure(thd);
}
/* We have to save also non-versioned on_expr since we may have
@ -754,15 +754,23 @@ setup_for_system_time(THD *thd, TABLE_LIST *tables, COND **where_expr, SELECT_LE
Field *fstart= table->table->vers_start_field();
Field *fend= table->table->vers_end_field();
DBUG_ASSERT(select_lex->parent_lex);
Name_resolution_context *context= select_lex->parent_lex->current_context();
DBUG_ASSERT(slex->parent_lex);
Name_resolution_context *context= slex->parent_lex->current_context();
DBUG_ASSERT(context);
Item *row_start= new (thd->mem_root) Item_field(thd, context, fstart);
Item *row_end= new (thd->mem_root) Item_field(thd, context, fend);
Item *row_end2= row_end;
if (!table->table->versioned_by_sql())
if (table->table->versioned_by_sql())
{
if (slex->vers_conditions.unit == UNIT_TRX_ID)
{
my_error(ER_VERS_TRX_ID_UNSUPPORTED, MYF(0), table->table_name);
DBUG_RETURN(-1);
}
}
else if (slex->vers_conditions.unit == UNIT_TIMESTAMP)
{
DBUG_ASSERT(table->table->s && table->table->s->db_plugin);
row_start= new (thd->mem_root) Item_func_vtq_ts(
@ -778,7 +786,7 @@ setup_for_system_time(THD *thd, TABLE_LIST *tables, COND **where_expr, SELECT_LE
}
Item *cond1= 0, *cond2= 0, *curr= 0;
switch (select_lex->vers_conditions.type)
switch (slex->vers_conditions.type)
{
case FOR_SYSTEM_TIME_UNSPECIFIED:
if (table->table->versioned_by_sql())
@ -796,21 +804,21 @@ setup_for_system_time(THD *thd, TABLE_LIST *tables, COND **where_expr, SELECT_LE
break;
case FOR_SYSTEM_TIME_AS_OF:
cond1= new (thd->mem_root) Item_func_le(thd, row_start,
select_lex->vers_conditions.start);
slex->vers_conditions.start);
cond2= new (thd->mem_root) Item_func_gt(thd, row_end,
select_lex->vers_conditions.start);
slex->vers_conditions.start);
break;
case FOR_SYSTEM_TIME_FROM_TO:
cond1= new (thd->mem_root) Item_func_lt(thd, row_start,
select_lex->vers_conditions.end);
slex->vers_conditions.end);
cond2= new (thd->mem_root) Item_func_ge(thd, row_end,
select_lex->vers_conditions.start);
slex->vers_conditions.start);
break;
case FOR_SYSTEM_TIME_BETWEEN:
cond1= new (thd->mem_root) Item_func_le(thd, row_start,
select_lex->vers_conditions.end);
slex->vers_conditions.end);
cond2= new (thd->mem_root) Item_func_ge(thd, row_end,
select_lex->vers_conditions.start);
slex->vers_conditions.start);
break;
default:
DBUG_ASSERT(0);