feat: add _repr_html_ for expressions to print as tables in ipython

ibis/expr/types/generic.py

@@ -2,6 +2,7 @@
 
 from public import public
 
+import ibis
 import ibis.common.exceptions as com
 
 from .core import Expr
@@ -77,6 +78,9 @@ def to_projection(self):
         table = TableExpr(roots[0])
         return table.projection([self])
 
+    def _repr_html_(self) -> str | None:
+        return None
+
 
 @public
 class ColumnExpr(ValueExpr):
@@ -103,6 +107,12 @@ def to_projection(self):
         table = TableExpr(roots[0])
         return table.projection([self])
 
+    def _repr_html_(self) -> str | None:
+        if not ibis.options.interactive:
+            return None
+
+        return self.execute().to_frame()._repr_html_()
+
 
 @public
 class AnyValue(ValueExpr):

ibis/expr/types/relations.py

@@ -5,6 +5,7 @@
 import numpy as np
 from public import public
 
+import ibis
 import ibis.common.exceptions as com
 import ibis.util as util
 
@@ -45,6 +46,12 @@ def _assert_valid(self, exprs):
     def __contains__(self, name):
         return name in self.schema()
 
+    def _repr_html_(self) -> str | None:
+        if not ibis.options.interactive:
+            return None
+
+        return self.execute()._repr_html_()
+
     def __getitem__(self, what):
         from .analytic import AnalyticExpr
         from .generic import ColumnExpr