3:42 p.m.
Add support for pushing joins through a union
---------------------------------------------
Key: TEIID-1376
URL: https://jira.jboss.org/browse/TEIID-1376
Project: Teiid
Issue Type: Feature Request
Components: Query Engine
Affects Versions: 7.2
Reporter: Steven Hawkins
Assignee: Steven Hawkins
Fix For: 7.3
Given a query structure such as:
inner join
union all
a
b
union all
c
d
where a,b,c,d are access nodes to a source that supports joins and there is a constant
column projected by each union branch and that column is used in the join predicates, then
we should be able examine
union all
inner join
a
b
inner join
a
c
...
to determine if any of the joins will no longer be necessary.
This is a possible pattern in a multi-source or partitioning scenario.
In some scenarios there may not be an actual projected literal, which could be
accommodated if a foreign key could be marked as partitioned.
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4:15 p.m.
New subject: [JBoss JIRA] Work started: (TEIID-1376) Add support for pushing joins through a union
[
https://issues.jboss.org/browse/TEIID-1376?page=com.atlassian.jira.plugin...
]
Work on TEIID-1376 started by Steven Hawkins.
Add support for pushing joins through a union
---------------------------------------------
Key: TEIID-1376
URL: https://issues.jboss.org/browse/TEIID-1376
Project: Teiid
Issue Type: Feature Request
Components: Query Engine
Affects Versions: 7.2
Reporter: Steven Hawkins
Assignee: Steven Hawkins
Fix For: 7.3
Given a query structure such as:
inner join
union all
a
b
union all
c
d
where a,b,c,d are access nodes to a source that supports joins and there is a constant
column projected by each union branch and that column is used in the join predicates, then
we should be able examine
union all
inner join
a
b
inner join
a
c
...
to determine if any of the joins will no longer be necessary.
This is a possible pattern in a multi-source or partitioning scenario.
In some scenarios there may not be an actual projected literal, which could be
accommodated if a foreign key could be marked as partitioned.
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11:57 a.m.
New subject: [JBoss JIRA] Resolved: (TEIID-1376) Add support for pushing joins through a union
[
https://issues.jboss.org/browse/TEIID-1376?page=com.atlassian.jira.plugin...
]
Steven Hawkins resolved TEIID-1376.
-----------------------------------
Resolution: Done
Added RuleDecomposeJoin to handle this situation. The decision to decompose is based upon
detecting that each side of the join is a partitioned union (note that non-ansi joins of
more than 2 tables may cause the optimization to not detect the appropriate join). Union
partitioning is inferred from the transformation/inline view. If one (or more) of the
union columns is defined by constants and/or has IN predicates in the WHERE clause that
make each branch mutually exclusive, then the union is considered partitioned. e.g.
"select 1 as x, y from foo union all select z, a from foo1 where z in (2, 3)"
would be considered partitioned on x. Note that more advanced or explicit partition could
be considered in the future.
The rule currently only looks for situations where at most 1 partition matches from each
side. This is a simplifying assumption based upon the lack of arbitrary sub-plan cloning
and potentially making the decision costing dependent.
The release notes have been updated, but the docs still need to add the concept of a
partitioned union. The concept of partitioning will also be used so that views with
unions can be inherently insertable.
Add support for pushing joins through a union
---------------------------------------------
Key: TEIID-1376
URL: https://issues.jboss.org/browse/TEIID-1376
Project: Teiid
Issue Type: Feature Request
Components: Query Engine
Affects Versions: 7.2
Reporter: Steven Hawkins
Assignee: Steven Hawkins
Fix For: 7.3
Given a query structure such as:
inner join
union all
a
b
union all
c
d
where a,b,c,d are access nodes to a source that supports joins and there is a constant
column projected by each union branch and that column is used in the join predicates, then
we should be able examine
union all
inner join
a
b
inner join
a
c
...
to determine if any of the joins will no longer be necessary.
This is a possible pattern in a multi-source or partitioning scenario.
In some scenarios there may not be an actual projected literal, which could be
accommodated if a foreign key could be marked as partitioned.
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11:59 a.m.
New subject: [JBoss JIRA] Updated: (TEIID-1376) Add support for pushing joins through a union
[
https://issues.jboss.org/browse/TEIID-1376?page=com.atlassian.jira.plugin...
]
Steven Hawkins updated TEIID-1376:
----------------------------------
Description:
Given a query structure such as:
inner join
union all
a
b
union all
c
d
where a,b,c,d are access nodes to a source that supports joins and there is a constant
column projected by each union branch and that column is used in the join predicates, then
we should be able examine
union all
inner join
a
c
inner join
a
d
...
to determine if any of the joins will no longer be necessary.
This is a possible pattern in a multi-source or partitioning scenario.
In some scenarios there may not be an actual projected literal, which could be
accommodated if a foreign key could be marked as partitioned.
was:
Given a query structure such as:
inner join
union all
a
b
union all
c
d
where a,b,c,d are access nodes to a source that supports joins and there is a constant
column projected by each union branch and that column is used in the join predicates, then
we should be able examine
union all
inner join
a
b
inner join
a
c
...
to determine if any of the joins will no longer be necessary.
This is a possible pattern in a multi-source or partitioning scenario.
In some scenarios there may not be an actual projected literal, which could be
accommodated if a foreign key could be marked as partitioned.
Add support for pushing joins through a union
---------------------------------------------
Key: TEIID-1376
URL: https://issues.jboss.org/browse/TEIID-1376
Project: Teiid
Issue Type: Feature Request
Components: Query Engine
Affects Versions: 7.2
Reporter: Steven Hawkins
Assignee: Steven Hawkins
Fix For: 7.3
Given a query structure such as:
inner join
union all
a
b
union all
c
d
where a,b,c,d are access nodes to a source that supports joins and there is a constant
column projected by each union branch and that column is used in the join predicates, then
we should be able examine
union all
inner join
a
c
inner join
a
d
...
to determine if any of the joins will no longer be necessary.
This is a possible pattern in a multi-source or partitioning scenario.
In some scenarios there may not be an actual projected literal, which could be
accommodated if a foreign key could be marked as partitioned.
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10:11 a.m.
New subject: [JBoss JIRA] Commented: (TEIID-1376) Add support for pushing joins through a union
[
https://issues.jboss.org/browse/TEIID-1376?page=com.atlassian.jira.plugin...
]
Steven Hawkins commented on TEIID-1376:
---------------------------------------
also added support for for partition wise aggregation if one of the grouping columns is a
partitioned column
Add support for pushing joins through a union
---------------------------------------------
Key: TEIID-1376
URL: https://issues.jboss.org/browse/TEIID-1376
Project: Teiid
Issue Type: Feature Request
Components: Query Engine
Affects Versions: 7.2
Reporter: Steven Hawkins
Assignee: Steven Hawkins
Fix For: 7.3
Given a query structure such as:
inner join
union all
a
b
union all
c
d
where a,b,c,d are access nodes to a source that supports joins and there is a constant
column projected by each union branch and that column is used in the join predicates, then
we should be able examine
union all
inner join
a
c
inner join
a
d
...
to determine if any of the joins will no longer be necessary.
This is a possible pattern in a multi-source or partitioning scenario.
In some scenarios there may not be an actual projected literal, which could be
accommodated if a foreign key could be marked as partitioned.
--
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12:04 p.m.
New subject: [JBoss JIRA] Closed: (TEIID-1376) Add support for pushing joins through a union
[
https://issues.jboss.org/browse/TEIID-1376?page=com.atlassian.jira.plugin...
]
Steven Hawkins closed TEIID-1376.
---------------------------------
Add support for pushing joins through a union
---------------------------------------------
Key: TEIID-1376
URL: https://issues.jboss.org/browse/TEIID-1376
Project: Teiid
Issue Type: Feature Request
Components: Query Engine
Affects Versions: 7.2
Reporter: Steven Hawkins
Assignee: Steven Hawkins
Fix For: 7.3
Given a query structure such as:
inner join
union all
a
b
union all
c
d
where a,b,c,d are access nodes to a source that supports joins and there is a constant
column projected by each union branch and that column is used in the join predicates, then
we should be able examine
union all
inner join
a
c
inner join
a
d
...
to determine if any of the joins will no longer be necessary.
This is a possible pattern in a multi-source or partitioning scenario.
In some scenarios there may not be an actual projected literal, which could be
accommodated if a foreign key could be marked as partitioned.
--
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Steven Hawkins (JIRA)