Co-authored-by: Roi Lipman <swilly22@users.noreply.github.com>
(cherry picked from commit 0ead11e)

* Refactor logic for invoking aggregate functions

* WIP

* Fix unit tests, stDevP logic

* Fix formatting flag

* reduce and evaluate aggregation functions

* consolidation agg and none agg functions

* Additional tests, comment corrections

Co-authored-by: swilly22 <roi@redislabs.com>
Co-authored-by: Roi Lipman <swilly22@users.noreply.github.com>
(cherry picked from commit aa66db8)

* global cache

* Replace the cache-per-thread with a global cache:
-Use rwlock to synchronize access to the cache.
-Replace the hash lookup of queries strings with rax to support safe access of multiple readers.
-When cache hit occurs, do (shallow) memcpy of the query AST along with reference count increase, and store the current execution params in the new AST copy.

* Fix memory leaks.
Bug fix: set AST in thread local storage after the shallow copy.

* Update comments in config files and number of threads in test_cache to fit the new cache design.

* Defending execution plans that are being cloned from evicted by another thread, by adding ref count.

* Change cache implementation so that cache item is copied within the cache get/set functions by using a callback. This ensures that cache item will not be freed when evicted from cache while it is cloned by another thread.

* Change cache implementation so that cache item is copied within the cache get/set functions by using a callback. This ensures that cache item will not be freed when evicted from cache while it is cloned by another thread.

* moved from ulong to long long

* refactor cache unit-test

* refactored cache

* Refactor cache_set and test_cache.

* mostly formatting

* switch to new config get

Co-authored-by: swilly22 <roi@redislabs.com>
Co-authored-by: Roi Lipman <swilly22@users.noreply.github.com>
(cherry picked from commit 75d0a99)

* Add support for startNode and endNode functions

* Address PR comments

(cherry picked from commit 584f59b)

* Disallow updating properties after deleting their entities

* Address PR comments

(cherry picked from commit 92125cf)

* Disallow assigning properties to complex types in MERGE SET constructions

* Address PR comments

(cherry picked from commit 6bc3552)

* Consider both filters and labels in selecting a starting point

* refactored traverse order

* Address PR comments

* Update test_traversal_ordering.cpp

Co-authored-by: swilly22 <roi@redislabs.com>
Co-authored-by: Roi Lipman <swilly22@users.noreply.github.com>
(cherry picked from commit 818e541)

* optimize expression before accessing it

* algebraic expression transposed should handle directly nested transposes

(cherry picked from commit 78f5310)

* Don't attempt to access non-existent properties

* Address PR comments

* Add additional tests

* Add documentation

* Skip tests that cause memory leaks

* Address PR comments

(cherry picked from commit 50aa868)

* Error on alias references in parameters

* Address PR comments

Co-authored-by: Roi Lipman <swilly22@users.noreply.github.com>
(cherry picked from commit aed3fba)

(cherry picked from commit 2b8a3c6)

(cherry picked from commit 9bcc2d2)