ingraph | Incremental view maintenance for openCypher graph queries
kandi X-RAY | ingraph Summary
kandi X-RAY | ingraph Summary
For a summary on the project, visit the ingraph web page. ingraph is built with the Gradle system.
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rm -rf graphs/ldbc-snb-bi/db-sftiny/graph.db/
unzip graphs/ldbc-snb-bi/db-sftiny.zip -d graphs/ldbc-snb-bi/
Community Discussions
Trending Discussions on ingraph
QUESTION
I keep getting this error for the code below.
Upon reading this, I believed my error to be the it++
in my for loop, which I tried replacing with next(it, 1)
but it didn't solve my problem.
My question is, is the iterator the one giving me the issue here?
...ANSWER
Answered 2020-Apr-27 at 09:35Is the iterator the one giving me the issue here?
No, rather the lack of custom comparator for std::set
causes the problem. Meaning, the compiler has to know, how to sort the std::set
of Node
s. By providing a suitable operator<
, you could fix it. See demo here
QUESTION
I would like to pass dynamic arrays to functions and receive user input. Currently I'm using the following code:
...ANSWER
Answered 2019-Jul-15 at 10:42Firstly, you shouldn't trying to initialize a static buildin array in run-time: Your implementation is wrong here:
QUESTION
I have a structure with arrays of structures inside in C, and I need a copy of that in the GPU. For that I am writing a function that makes some cudaMalloc
and cudaMemcpy
s of the variables in the struct from host to device.
A simple version (the real one has various structs and variables/arrays inside) of the struct is:
...ANSWER
Answered 2018-Jul-19 at 12:31The problem is in the function cudaGraphMalloc
where you are trying to allocate device memory to the members of outGraph
which has already been allocated on the device. In process of doing so, you are de-referencing a device pointer on host which is illegal.
To allocate device memory to members of struct
type variable which exists on the device, we first have to create a temporary host variable of that struct
type, then allocate device memory to its members, and then copy it to the struct which exists on the device.
I have answered a similar question here. Please take a look at it.
The fixed code may look like this:
QUESTION
If I want to delete age
from the JSON in first output. Is there a way to do that in one step, in other words, not invoking jq 2 times?
ANSWER
Answered 2018-Mar-06 at 10:05It is quite simple when using jq
using the map()
call.
QUESTION
I develop a Scala project in IntelliJ IDEA (GitHub repository). The project is built with Gradle 4.3 and uses ScalaTest plus its latest Gradle plugin for testing (id 'com.github.maiflai.scalatest' version '0.19'
). The version of the Scala plug-in is 2017.3.11.1
The project has two levels of hierarchy: the parent project at the root level and the subprojects as the children. The tests use input files that are located in the root level (e.g. the ./compiler/
dir's project uses files from the ./queries/
dir). Tests refer to the files with relative paths: for example, if the compiler uses query files, it refers to them as ../queries/query-file.ext
.
With this setup, tests work fine from the command line when running ./gradlew test
. However, when I run a new test form IntelliJ, the working directory is always set to the root level, which breaks the tests. (Of course, this can be fixed manually, but this has to be done for each test executed). Note that I imported the project to IntelliJ IDEA using the "Create separate module per source set" setting (because of issue SCL-12718, which is not yet fixed in stable - and I am unsure whether this will fix the problem).
Is there a way to fix or work around this? Updating the ScalaTest Gradle configuration to use the directory of the current subproject or reconfiguring IntelliJ to use the directory of the parent project would both work for me.
...ANSWER
Answered 2018-Feb-21 at 10:19You can change the default working dir for the tests in IntelliJ by doing:
- Open Run -> Edit Configurations ...
- Expand the "Defaults" section in the left hand pane, select the "Scala Test" item
- Set the "Working Directory" field
It would probably be better to change the tests to not rely on the working directory though. If you access the "queries" files as JVM resources instead of opening them by relative path, it should work in both environments. See How do I load a file from resource folder?
QUESTION
I use Spark Catalyst for representing the query plans for an openCypher query engine, ingraph. During the query planning process, I would like to convert from a certain logical plan (Plan1
) to another logical plan (Plan2
). (I try to keep the question simple, so I omitted some details here. The project is fully open-source, so if required, I am happy to provide more information on why this is necessary.)
The best approach I could find is to use transformDown
recursively. Here is a small example that converts from Plan1Node
s to Plan2Node
s by replacing each OpA1
instance with OpA2
and each OpB1
instance with OpB2
.
ANSWER
Answered 2017-Aug-20 at 10:32(Answering my own question.)
Changing transformDown
to a simple pattern matching (match
) and recursive calls solved the type issue:
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