If no chunking was requested by the user, the co-ordinating node buffers all
results in RAM before emitting a single result. However buffering was not
merging results for rows which had data for the same series. This change fixes this.
Fixes issue #3242.
Any literal values in a math query e.g. the '2' in 'value * 2' are
stored as float64, so all other values must be cast to this type. This
does mean that precision may be lost if the integer values are greater
than 2^53.
When stringifying a query, we would print the identifier bare most
of the time. This caused issues when stringifying an identifier
that contained elements of syntax. For example, querying for the
value "in-bytes" would fail because the mapper would serialize it to
in-bytes and would parse it as an expression. Same problem occured
when using keywords as identifier names, such as select or in.
Fixes#3547
This change moves tracking of next timestamp and values to simple
slices, as performance measurement showed that Peek() on TagSet cursors
was a huge performance drain. There is much more that can be done here,
but with this in place query performance has been restored to 0.9.1
levels.
This change also uses -1 to indicate that no value is available for a
given timestamp.
Previously, parseRegex could return an empty RegexLiteral
and the expression parser would put that into the right-hand
side of the expression, causing a nil-pointer panic when
the query was later executed. This change adds a check at
the parsing level and returns an error message if a regex
operator (e.g. =~) is not followed by an actual regex.
With this change, the query engine code gathers information about
shards and tagsets by working with individual shards, collating the
information, and returning that to the client. It does not assume that any
particular shard is local, and accesses all shards through abstracted
Mappers, of which there are two types -- a Mapper type for Raw queries
and a second type for Aggregate queries. There are corresponding
Executors for each type of Mapper, but both types of Executors share the
same interface.
Philip O'Toole
Daniel Morsing
Cory LaNou
Cory LaNou
David Norton
Gunnar
Haneysmith, Nathan
Josh Horwitz
Jason Wilder
Philip O'Toole
gunnaraasen
Alexander Morozov
Robert Nubel
Joseph Crail
Henrik Johansson
Dejan Golja
林芳荣
Pradeep Chhetri
linfangrong
Paul Dix