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MXS-1248: Further modifications for CTE

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- Fields in CTEs are marked as being used in subselects.
- In qc_mysqlembedded all selects must be walked if CTE is present.
- In qc_sqlite unions need special handling.
This commit is contained in:
Johan Wikman 2017-06-30 12:47:46 +02:00
parent b5d54292a4
commit d060320b36
2 changed files with 33 additions and 16 deletions
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42
query_classifier/qc_mysqlembedded/qc_mysqlembedded.cc
View File

@ -2872,6 +2872,9 @@ int32_t qc_mysql_get_field_info(GWBUF* buf, const QC_FIELD_INFO** infos, uint32_
#ifdef CTE_SUPPORTED
if (lex->with_clauses_list)
{
usage &= ~QC_USED_IN_SELECT;
usage |= QC_USED_IN_SUBSELECT;
With_clause* with_clause = lex->with_clauses_list;
while (with_clause)
@ -2923,23 +2926,32 @@ int32_t qc_mysql_get_field_info(GWBUF* buf, const QC_FIELD_INFO** infos, uint32_
}
}
#ifdef CTE_SUPPORTED
if ((lex->sql_command == SQLCOM_SET_OPTION) ||
(lex->with_clauses_list))
#else
if (lex->sql_command == SQLCOM_SET_OPTION)
{
#if defined(WAY_TO_DOWNCAST_SET_VAR_BASE_EXISTS)
// The list of set_var_base contains the value of variables.
// However, the actual type is a derived type of set_var_base
// and there is no information using which we could do the
// downcast...
List_iterator<set_var_base> ilist(lex->var_list);
while (set_var_base* var = ilist++)
{
// Is set_var_base a set_var, set_var_user, set_var_password
// set_var_role
...
}
#endif
// ...so, we will simply assume that any nested selects are
// from statements like "set @a:=(SELECT a from t1)".
{
if (lex->sql_command == SQLCOM_SET_OPTION)
{
#if defined(WAY_TO_DOWNCAST_SET_VAR_BASE_EXISTS)
// The list of set_var_base contains the value of variables.
// However, the actual type is a derived type of set_var_base
// and there is no information using which we could do the
// downcast...
List_iterator<set_var_base> ilist(lex->var_list);
while (set_var_base* var = ilist++)
{
// Is set_var_base a set_var, set_var_user, set_var_password
// set_var_role
...
}
#endif
// ...so, we will simply assume that any nested selects are
// from statements like "set @a:=(SELECT a from t1)". The
// code after the closing }.
}
usage &= ~QC_USED_IN_SELECT;
usage |= QC_USED_IN_SUBSELECT;

7
query_classifier/qc_sqlite/qc_sqlite.c
View File

@ -1081,7 +1081,7 @@ static void update_field_infos_from_with(QC_SQLITE_INFO* info,
if (pCte->pSelect)
{
update_field_infos_from_select(info, pCte->pSelect, QC_USED_IN_SELECT, NULL);
update_field_infos_from_select(info, pCte->pSelect, QC_USED_IN_SUBSELECT, NULL);
}
}
}
@ -1487,6 +1487,11 @@ static void update_field_infos_from_select(QC_SQLITE_INFO* info,
{
update_field_infos_from_with(info, pSelect->pWith);
}
if ((pSelect->op == TK_UNION) && pSelect->pPrior)
{
update_field_infos_from_select(info, pSelect->pPrior, usage, pExclude);
}
}
static void update_database_names(QC_SQLITE_INFO* info, const char* zDatabase)