Summary:
This change only adds streaming support to the client request. The client
response, server request and server response are still handled only when all of
the data is received.
Reviewers: buda
Reviewed By: buda
Subscribers: pullbot
Differential Revision: https://phabricator.memgraph.io/D2807
Summary:
SLK now correctly handles different CPU architectures (BIG/little endian).
Also, more string encoding functions have been added.
Reviewers: buda
Reviewed By: buda
Subscribers: pullbot
Differential Revision: https://phabricator.memgraph.io/D2806
Summary:
This diff fixes the variable expand operator to work correctly then the start
and destination nodes use the same symbol or when the destination symbol is an
existing symbol.
Previously, the variable expand operator produced paths that were both
completely wrong (they shouldn't have been produced) and nonexistent (they
didn't even exist in the storage). Invalid data was produced because of a
wrong equality check that was introduced in D1703.
This issue was reported externally and the supplied test case was:
```
CREATE (p1:Person {id: 1})-[:KNOWS]->(:Person {id: 2})-[:KNOWS]->(:Person {id: 3})-[:KNOWS]->(:Person {id: 4})-[:KNOWS]->(p1);
MATCH path = (pers:Person {id: 3})-[:KNOWS*2]->(pers) RETURN path;
```
Also, tests have been added so the behavior remains correct.
Reviewers: buda
Reviewed By: buda
Subscribers: pullbot
Differential Revision: https://phabricator.memgraph.io/D2793
Summary:
Semantics of 'all' and 'single' were updated to be
consistent with that of 'any' and 'none'
Reviewers: mferencevic
Reviewed By: mferencevic
Subscribers: pullbot
Differential Revision: https://phabricator.memgraph.io/D2789
Summary: Change any function's handling of Null elements in a list
Reviewers: mferencevic
Reviewed By: mferencevic
Subscribers: pullbot
Differential Revision: https://phabricator.memgraph.io/D2787
Summary:
`DUMP DATABASE` used a separate transaction to read database data. That
wouldn't be an issue if the query was correctly disallowed in multicommand
transactions. Because it was allowed the output wasn't transactionally correct.
Instead of disabling `DUMP DATABASE` in multicommand transactions this change
fixes it so that it works properly in multicommand transactions.
Reviewers: buda
Reviewed By: buda
Subscribers: pullbot
Differential Revision: https://phabricator.memgraph.io/D2781
Summary:
Before this change properties were joined by ", " and returned as a single string,
which was ambiguous for properties that contain ", ". This diff solves this
problem by returning properties as a list type.
Reviewers: mferencevic
Reviewed By: mferencevic
Subscribers: pullbot
Differential Revision: https://phabricator.memgraph.io/D2778
Summary:
This diff fixes the issue for label name (and edge type/property)
with spaces and special characters to avoid possible OpenCypher injections.
Consider an example where label name is 'hello :world'. `DUMP DATABASE`
used to return query which creates a node (u:hello :world) - i.e. node
that contains two labels 'hello' and 'world'. This fix escapes names to
create the following node with exactly one label as expected:
```
(u:`hello :world`)
```
Reviewers: mferencevic
Reviewed By: mferencevic
Subscribers: pullbot
Differential Revision: https://phabricator.memgraph.io/D2774
Summary:
This diff improves the performance of `PropertyStore` with two main
techniques:
First:
`PropertyValue` has a very expensive constructor and destructor. The
`PropertyValue` was previously passed as a return value from many functions
wrapped in a `std::optional`. That caused the `PropertyValue`
constructor/destructor to be called for each intermediary value that was passed
between functions. This diff changes the functions to return a `bool` value
that imitates the `std::optional` "emptyness" flag and the `PropertyValue` is
modified using a pointer to it so that its constructor/destructor is called
only once.
Second:
The `PropertyStore` buffer was previously iterated through at least twice.
First to determine the exact position of the encoded property and then to
actually decode the property. This diff combines the two passes into a single
pass so that the property is immediately loaded if it is found.
Reviewers: buda
Reviewed By: buda
Subscribers: pullbot
Differential Revision: https://phabricator.memgraph.io/D2766
Summary:
Use Unwind + ScanAllByLabelPropertyValue logical operator to
accelerate the execution of queries like the following one:
`MATCH (n:Label) WHERE n.property IN [] ...`
Reviewers: llugovic, mferencevic
Reviewed By: llugovic, mferencevic
Subscribers: llugovic, pullbot
Differential Revision: https://phabricator.memgraph.io/D2758
Summary: The same test is written both for label indices and label+property indices.
Reviewers: buda
Reviewed By: buda
Subscribers: pullbot
Differential Revision: https://phabricator.memgraph.io/D2741
Summary:
This fixes an issue in Py(Vertex|Edge)GetProperty and prevents any
further issues of that type at the cost of additional typing effort.
Reviewers: ipaljak, llugovic
Reviewed By: ipaljak, llugovic
Subscribers: pullbot
Differential Revision: https://phabricator.memgraph.io/D2735
Summary:
The storage now uses a file in the data directory (`.lock`) to determine
whether there is another instance of the storage running with the same data
directory. That helps notify the user/administrator that the system is running
in an unsupported configuration.
Reviewers: teon.banek, ipaljak
Reviewed By: teon.banek
Subscribers: pullbot
Differential Revision: https://phabricator.memgraph.io/D2719
Summary:
The importer now supports all of the flags that the modern Neo4j CSV importer
supports.
Reviewers: teon.banek, ipaljak
Reviewed By: teon.banek
Subscribers: pullbot
Differential Revision: https://phabricator.memgraph.io/D2709
Summary:
This diff contains simple tests for unique constraints which tries to
change property values or labels in multiple threads at the same time.
During testing, a bug has been encountered in unique constraints, i.e.
one guard lock on vertices was missing.
Reviewers: mferencevic
Reviewed By: mferencevic
Subscribers: mferencevic, pullbot
Differential Revision: https://phabricator.memgraph.io/D2711
Summary:
This diff contains a necessary functionality to save and restore unique
constraint operations. The previous snapshot/WAL version is backward
compatible. Integration tests for migration from older snapshot and WAL
versions are also included.
Reviewers: mferencevic
Reviewed By: mferencevic
Subscribers: pullbot
Differential Revision: https://phabricator.memgraph.io/D2680
Summary:
The new CSV parser in `mg_import_csv` behaves the same when importing a CSV
file as the standard Python CSV importer. Tests are added for all CSV field
edge-cases.
Reviewers: teon.banek, ipaljak
Reviewed By: teon.banek
Subscribers: pullbot
Differential Revision: https://phabricator.memgraph.io/D2702
Summary:
When invoking a Python registered procedures we want to convert
`mgp_value` types to user facing 'mgp' types.
Depends on D2706
Reviewers: mferencevic, ipaljak
Reviewed By: mferencevic
Subscribers: pullbot
Differential Revision: https://phabricator.memgraph.io/D2707
Summary:
This diff restores (and fixes) the old mg_import_csv implementation. The
importer now supports the new storage engine.
Reviewers: teon.banek, ipaljak
Reviewed By: teon.banek, ipaljak
Subscribers: buda, pullbot
Differential Revision: https://phabricator.memgraph.io/D2690
Summary:
Now that unique constraint feature is added to Memgraph database,
we should update `DUMP DATABASE` with list of existing unique constraints.
Reviewers: mferencevic
Reviewed By: mferencevic
Subscribers: pullbot
Differential Revision: https://phabricator.memgraph.io/D2698
Summary:
Before this change, unique constraints supported only pairs of label
and a single property. With this change, unique constraints can be
created for label and set of properties.
Better tests for unique constraints in general are also included in
this diff.
Reviewers: mferencevic, teon.banek
Reviewed By: mferencevic
Subscribers: pullbot
Differential Revision: https://phabricator.memgraph.io/D2653
Summary:
This diff contains a basic implementation of unique constraints consistent with
the MVCC storage.
Stale records in the unique constraints are collected by the garbage collector.
Tests for checking correctness of unique constraints and violations are included.
Note: currently we only support a pair of label and a single property. Support for
multiple properties will be added later.
Reviewers: mferencevic, teon.banek
Reviewed By: mferencevic, teon.banek
Subscribers: buda, ipaljak, pullbot
Differential Revision: https://phabricator.memgraph.io/D2608
