Add generate_series() udtf (and introduce 'lazy' MemoryExec) (apach…

…e#13540)

* Add generate_series() udtf

* liscence

* fix examples

* clippy

* comments

* singleton udtf init

* StreamingMemoryExec -> LazyMemoryExec

* use RwLock

* test udf+udtf generate_series() in the same sql

* CI

* CI

* small fixes

Cargo.toml

@@ -30,6 +30,7 @@ members = [
     "datafusion/functions",
     "datafusion/functions-aggregate",
     "datafusion/functions-aggregate-common",
+    "datafusion/functions-table",
     "datafusion/functions-nested",
     "datafusion/functions-window",
     "datafusion/functions-window-common",
@@ -108,6 +109,7 @@ datafusion-functions = { path = "datafusion/functions", version = "43.0.0" }
 datafusion-functions-aggregate = { path = "datafusion/functions-aggregate", version = "43.0.0" }
 datafusion-functions-aggregate-common = { path = "datafusion/functions-aggregate-common", version = "43.0.0" }
 datafusion-functions-nested = { path = "datafusion/functions-nested", version = "43.0.0" }
+datafusion-functions-table = { path = "datafusion/functions-table", version = "43.0.0" }
 datafusion-functions-window = { path = "datafusion/functions-window", version = "43.0.0" }
 datafusion-functions-window-common = { path = "datafusion/functions-window-common", version = "43.0.0" }
 datafusion-optimizer = { path = "datafusion/optimizer", version = "43.0.0", default-features = false }