Refactor list comprehension & bug fixes (#8)

* refactor

* additional test cases

core/Cargo.toml

@@ -1,42 +1,43 @@
-[package]
-name = "drasi-core"
-version.workspace = true
-edition = "2021"
-
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
-[features]
-default = []
-parallel_solver = []
-
-[dependencies]
-async-trait = "0.1.68"
-drasi-query-ast = { path = "../query-ast" }
-drasi-query-cypher = { path = "../query-cypher" }
-hashers = "1.0.1"
-ordered-float = "3.7.0"
-serde = { version = "1", features = ["derive"] }
-serde_json = "1"
-rand = { version = "0.8.5", features = ["small_rng"] }
-tokio = { version =  "1.29.1", features = ["full"] }
-async-recursion = "1.0.4"
-futures = "0.3.28"
-tokio-stream = "0.1.14"
-async-stream = "0.3.5"
-itoa = "1.0.1"
-caches = "0.2.4"
-log = "0.4.20"
-tracing = "0.1.37"
-opentelemetry = "0.20"
-chrono = { version = "0.4.31", features = ["serde"] }
-dateparser = "0.2.0"
-chrono-tz = "0.8.3"
-regex = "1.9.5"
-zoneinfo_parse = "0.1.4"
-iso8601-duration = "0.2.0"
-round = "0.1.2"
-priority-queue = "1.3.2"
-thiserror = "1.0.50"
-statistical = "1.0.0"
-approx = "0.5.1"
-lazy_static = "1.4.0"
+[package]
+name = "drasi-core"
+version.workspace = true
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[features]
+default = []
+parallel_solver = []
+
+[dependencies]
+async-trait = "0.1.68"
+drasi-query-ast = { path = "../query-ast" }
+drasi-query-cypher = { path = "../query-cypher" }
+hashers = "1.0.1"
+ordered-float = "3.7.0"
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+rand = { version = "0.8.5", features = ["small_rng"] }
+tokio = { version =  "1.29.1", features = ["full"] }
+async-recursion = "1.0.4"
+futures = "0.3.28"
+tokio-stream = "0.1.14"
+async-stream = "0.3.5"
+itoa = "1.0.1"
+caches = "0.2.4"
+log = "0.4.20"
+tracing = "0.1.37"
+opentelemetry = "0.20"
+chrono = { version = "0.4.31", features = ["serde"] }
+dateparser = "0.2.0"
+chrono-tz = "0.8.3"
+regex = "1.9.5"
+zoneinfo_parse = "0.1.4"
+iso8601-duration = "0.2.0"
+round = "0.1.2"
+priority-queue = "1.3.2"
+thiserror = "1.0.50"
+statistical = "1.0.0"
+approx = "0.5.1"
+lazy_static = "1.4.0"
+once_cell = "1.19.0"