Add built-in stats rewrite rules

Signed-off-by: Nicholas Gates <nick@nickgates.com>

Author: gatesn

vortex-array/public-api.lock

@@ -20128,7 +20128,7 @@ pub struct vortex_array::stats::session::StatsRewriteSession
 
 impl core::default::Default for vortex_array::stats::StatsRewriteSession
 
-pub fn vortex_array::stats::StatsRewriteSession::default() -> vortex_array::stats::StatsRewriteSession
+pub fn vortex_array::stats::StatsRewriteSession::default() -> Self
 
 impl core::fmt::Debug for vortex_array::stats::StatsRewriteSession
 
@@ -20204,7 +20204,7 @@ pub struct vortex_array::stats::StatsRewriteSession
 
 impl core::default::Default for vortex_array::stats::StatsRewriteSession
 
-pub fn vortex_array::stats::StatsRewriteSession::default() -> vortex_array::stats::StatsRewriteSession
+pub fn vortex_array::stats::StatsRewriteSession::default() -> Self
 
 impl core::fmt::Debug for vortex_array::stats::StatsRewriteSession
 

vortex-array/src/stats/rewrite.rs

@@ -14,6 +14,10 @@ use crate::expr::or_collect;
 use crate::scalar_fn::ScalarFnId;
 use crate::stats::session::StatsRewriteSessionExt;
 
+mod builtins;
+
+pub(crate) use builtins::register_builtins;
+
 /// Shared reference to a stats rewrite rule.
 pub(crate) type StatsRewriteRuleRef = Arc<dyn StatsRewriteRule>;