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changelog formatting

This commit is contained in:
Simran Brucherseifer 2016-10-20 11:01:05 +02:00
parent ac87b7bc0f
commit b376769514
1 changed files with 27 additions and 22 deletions
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CHANGELOG
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@ -39,39 +39,44 @@ devel
* fixed issue #2071 * fixed issue #2071
make the AQL query optimizer inject filter condition expressions referred to by variables during filter condition aggregation. make the AQL query optimizer inject filter condition expressions referred to
for example, in the following query by variables during filter condition aggregation.
For example, in the following query
FOR doc IN collection FOR doc IN collection
LET cond1 = (doc.value == 1) LET cond1 = (doc.value == 1)
LET cond2 = (doc.value == 2) LET cond2 = (doc.value == 2)
FILTER cond1 || cond2 FILTER cond1 || cond2
RETURN { doc, cond1, cond2 } RETURN { doc, cond1, cond2 }
the optimizer will now inject the conditions for `cond1` and `cond2` into the filter condition `cond1 || cond2`, expanding it to the optimizer will now inject the conditions for `cond1` and `cond2` into the filter
`(doc.value == 1) || (doc.value == 2)` and making these conditions available for index searching. condition `cond1 || cond2`, expanding it to `(doc.value == 1) || (doc.value == 2)`
and making these conditions available for index searching.
note that the optimizer previously already injected some conditions into other conditions, but only if the variable that defined Note that the optimizer previously already injected some conditions into other
the condition was not used elsewhere. for example, the filter condition in the query conditions, but only if the variable that defined the condition was not used
elsewhere. For example, the filter condition in the query
FOR doc IN collection FOR doc IN collection
LET cond = (doc.value == 1) LET cond = (doc.value == 1)
FILTER cond FILTER cond
RETURN { doc } RETURN { doc }
already got optimized before because `cond` was only used once in the query and the optimizer decided to inject it into the already got optimized before because `cond` was only used once in the query and
place where it was used. the optimizer decided to inject it into the place where it was used.
this only worked for variables that were referred to once in the query. when a variable was used multiple times, the condition This only worked for variables that were referred to once in the query.
was not injected as in the following query When a variable was used multiple times, the condition was not injected as
in the following query:
FOR doc IN collection FOR doc IN collection
LET cond = (doc.value == 1) LET cond = (doc.value == 1)
FILTER cond FILTER cond
RETURN { doc, cond } RETURN { doc, cond }
the fix for #2070 now will enable this optimization so that the query can use an index on `doc.value` if available.
The fix for #2070 now will enable this optimization so that the query can
use an index on `doc.value` if available.
* changed behavior of AQL array comparison operators for empty arrays: * changed behavior of AQL array comparison operators for empty arrays:
* `ALL` and `ANY` now always return `false` when the left-hand operand is an * `ALL` and `ANY` now always return `false` when the left-hand operand is an
empty array. The behavior for non-empty arrays does not change: empty array. The behavior for non-empty arrays does not change: