Informix - Problem description
Problem IT28161 | Status: Closed |
HASH JOIN EXECUTION SHOULD BE AVOIDED IF EITHER BUILD OR PROBE SIDE ALREADY KNOWN TO BE EMPTY | |
product: | |
INFORMIX SERVER / 5725A3900 / C10 - IDS 12.10 | |
Problem description: | |
An expensive (non-outer) hash join, once chosen by the query optimizer, seems to get executed even in cases where a zero-rows outcome already can be predicted by either the build or the probe side having no rows. | |
Problem Summary: | |
**************************************************************** * USERS AFFECTED: * * Users of IDS prior to 12.10.xC13. * **************************************************************** * PROBLEM DESCRIPTION: * * An expensive (non-outer) hash join, once chosen by the query * * optimizer, seems to get executed even in cases where a * * zero-rows outcome already can be predicted by either the * * build or the probe side having no rows. * **************************************************************** * RECOMMENDATION: * **************************************************************** | |
Local Fix: | |
Solution | |
Workaround | |
not known / see Local fix | |
Timestamps | |
Date - problem reported : Date - problem closed : Date - last modified : | 19.02.2019 24.09.2019 24.09.2019 |
Problem solved at the following versions (IBM BugInfos) | |
12.10.xC13 | |
Problem solved according to the fixlist(s) of the following version(s) |