fix(sql): properly parenthesize binary ops containing named expressions

ibis/backends/sql/compilers/base.py

@@ -689,9 +689,6 @@ def visit_Cast(self, op, *, arg, to):
     def visit_ScalarSubquery(self, op, *, rel):
         return rel.this.subquery(copy=False)
 
-    def visit_Alias(self, op, *, arg, name):
-        return arg
-
     def visit_Literal(self, op, *, value, dtype):
         """Compile a literal value.
 

ibis/backends/sql/compilers/bigquery/__init__.py

@@ -1017,7 +1017,14 @@ def visit_DropColumns(self, op, *, parent, columns_to_drop):
         return sg.select(column).from_(parent)
 
     def visit_TableUnnest(
-        self, op, *, parent, column, offset: str | None, keep_empty: bool
+        self,
+        op,
+        *,
+        parent,
+        column,
+        column_name: str,
+        offset: str | None,
+        keep_empty: bool,
     ):
         quoted = self.quoted
 
@@ -1029,9 +1036,8 @@ def visit_TableUnnest(
 
         table = sg.to_identifier(parent.alias_or_name, quoted=quoted)
 
-        opname = op.column.name
-        overlaps_with_parent = opname in op.parent.schema
-        computed_column = column_alias.as_(opname, quoted=quoted)
+        overlaps_with_parent = column_name in op.parent.schema
+        computed_column = column_alias.as_(column_name, quoted=quoted)
 
         # replace the existing column if the unnested column hasn't been
         # renamed

ibis/backends/sql/compilers/clickhouse.py

@@ -688,7 +688,14 @@ def visit_DropColumns(self, op, *, parent, columns_to_drop):
         return sg.select(column).from_(parent)
 
     def visit_TableUnnest(
-        self, op, *, parent, column, offset: str | None, keep_empty: bool
+        self,
+        op,
+        *,
+        parent,
+        column,
+        column_name: str,
+        offset: str | None,
+        keep_empty: bool,
     ):
         quoted = self.quoted
 
@@ -700,9 +707,8 @@ def visit_TableUnnest(
 
         selcols = []
 
-        opname = op.column.name
-        overlaps_with_parent = opname in op.parent.schema
-        computed_column = column_alias.as_(opname, quoted=quoted)
+        overlaps_with_parent = column_name in op.parent.schema
+        computed_column = column_alias.as_(column_name, quoted=quoted)
 
         if offset is not None:
             if overlaps_with_parent:

ibis/backends/sql/compilers/duckdb.py

@@ -609,15 +609,21 @@ def visit_DropColumns(self, op, *, parent, columns_to_drop):
         return sg.select(column).from_(parent)
 
     def visit_TableUnnest(
-        self, op, *, parent, column, offset: str | None, keep_empty: bool
+        self,
+        op,
+        *,
+        parent,
+        column,
+        column_name: str,
+        offset: str | None,
+        keep_empty: bool,
     ):
         quoted = self.quoted
 
         column_alias = sg.to_identifier(gen_name("table_unnest_column"), quoted=quoted)
 
-        opname = op.column.name
-        overlaps_with_parent = opname in op.parent.schema
-        computed_column = column_alias.as_(opname, quoted=quoted)
+        overlaps_with_parent = column_name in op.parent.schema
+        computed_column = column_alias.as_(column_name, quoted=quoted)
 
         selcols = []
 
@@ -627,7 +633,9 @@ def visit_TableUnnest(
             # TODO: clean this up once WITH ORDINALITY is supported in DuckDB
             # no need for struct_extract once that's upstream
             column = self.f.list_zip(column, self.f.range(self.f.len(column)))
-            extract = self.f.struct_extract(column_alias, 1).as_(opname, quoted=quoted)
+            extract = self.f.struct_extract(column_alias, 1).as_(
+                column_name, quoted=quoted
+            )
 
             if overlaps_with_parent:
                 replace = sge.Column(this=sge.Star(replace=[extract]), table=table)

ibis/backends/sql/compilers/postgres.py

@@ -718,18 +718,24 @@ def visit_Hash(self, op, *, arg):
         )
 
     def visit_TableUnnest(
-        self, op, *, parent, column, offset: str | None, keep_empty: bool
+        self,
+        op,
+        *,
+        parent,
+        column,
+        column_name: str,
+        offset: str | None,
+        keep_empty: bool,
     ):
         quoted = self.quoted
 
         column_alias = sg.to_identifier(gen_name("table_unnest_column"), quoted=quoted)
 
         parent_alias = parent.alias_or_name
 
-        opname = op.column.name
         parent_schema = op.parent.schema
-        overlaps_with_parent = opname in parent_schema
-        computed_column = column_alias.as_(opname, quoted=quoted)
+        overlaps_with_parent = column_name in parent_schema
+        computed_column = column_alias.as_(column_name, quoted=quoted)
 
         selcols = []
 

ibis/backends/sql/compilers/pyspark.py

@@ -500,16 +500,22 @@ def visit_HexDigest(self, op, *, arg, how):
             raise NotImplementedError(f"No available hashing function for {how}")
 
     def visit_TableUnnest(
-        self, op, *, parent, column, offset: str | None, keep_empty: bool
+        self,
+        op,
+        *,
+        parent,
+        column,
+        column_name: str,
+        offset: str | None,
+        keep_empty: bool,
     ):
         quoted = self.quoted
 
         column_alias = sg.to_identifier(gen_name("table_unnest_column"), quoted=quoted)
 
-        opname = op.column.name
         parent_schema = op.parent.schema
-        overlaps_with_parent = opname in parent_schema
-        computed_column = column_alias.as_(opname, quoted=quoted)
+        overlaps_with_parent = column_name in parent_schema
+        computed_column = column_alias.as_(column_name, quoted=quoted)
 
         parent_alias = parent.alias_or_name
 

ibis/backends/sql/compilers/snowflake.py

@@ -810,7 +810,14 @@ def visit_DropColumns(self, op, *, parent, columns_to_drop):
         return sg.select(column).from_(parent)
 
     def visit_TableUnnest(
-        self, op, *, parent, column, offset: str | None, keep_empty: bool
+        self,
+        op,
+        *,
+        parent,
+        column,
+        column_name: str,
+        offset: str | None,
+        keep_empty: bool,
     ):
         quoted = self.quoted
 
@@ -825,12 +832,10 @@ def visit_TableUnnest(
 
         selcols = []
 
-        opcol = op.column
-        opname = opcol.name
-        overlaps_with_parent = opname in op.parent.schema
+        overlaps_with_parent = column_name in op.parent.schema
         computed_column = self.cast(
-            self.f.nullif(column_alias, null_sentinel), opcol.dtype.value_type
-        ).as_(opname, quoted=quoted)
+            self.f.nullif(column_alias, null_sentinel), op.column.dtype.value_type
+        ).as_(column_name, quoted=quoted)
 
         if overlaps_with_parent:
             selcols.append(

ibis/backends/sql/compilers/trino.py

@@ -546,16 +546,22 @@ def visit_ToJSONArray(self, op, *, arg):
         )
 
     def visit_TableUnnest(
-        self, op, *, parent, column, offset: str | None, keep_empty: bool
+        self,
+        op,
+        *,
+        parent,
+        column,
+        column_name: str,
+        offset: str | None,
+        keep_empty: bool,
     ):
         quoted = self.quoted
 
         column_alias = sg.to_identifier(gen_name("table_unnest_column"), quoted=quoted)
 
-        opname = op.column.name
         parent_schema = op.parent.schema
-        overlaps_with_parent = opname in parent_schema
-        computed_column = column_alias.as_(opname, quoted=quoted)
+        overlaps_with_parent = column_name in parent_schema
+        computed_column = column_alias.as_(column_name, quoted=quoted)
 
         parent_alias_or_name = parent.alias_or_name
 

ibis/backends/sql/rewrites.py

@@ -165,7 +165,7 @@ def fill_null_to_select(_, **kwargs):
     for name in _.parent.schema.names:
         col = ops.Field(_.parent, name)
         if (value := mapping.get(name)) is not None:
-            col = ops.Alias(ops.Coalesce((col, value)), name)
+            col = ops.Coalesce((col, value))
         selections[name] = col
 
     return Select(_.parent, selections=selections)
@@ -206,6 +206,12 @@ def first_to_firstvalue(_, **kwargs):
     return _.copy(func=klass(_.func.arg))
 
 
+@replace(p.Alias)
+def remove_aliases(_, **kwargs):
+    """Remove all remaining aliases, they're not needed for remaining compilation."""
+    return _.arg
+
+
 def complexity(node):
     """Assign a complexity score to a node.
 
@@ -372,6 +378,7 @@ def sqlize(
     context = {"params": params}
     result = node.replace(
         replace_parameter
+        | remove_aliases
         | project_to_select
         | filter_to_select
         | sort_to_select

ibis/backends/tests/sql/snapshots/test_compiler/test_subquery_where_location/decompiled.py

@@ -11,7 +11,7 @@
     },
 )
 param = ibis.param("timestamp")
-f = alltypes.filter((alltypes.timestamp_col < param.name("my_param")))
+f = alltypes.filter((alltypes.timestamp_col < param))
 agg = f.aggregate([f.float_col.sum().name("foo")], by=[f.string_col])
 
 result = agg.foo.count()

ibis/backends/tests/sql/snapshots/test_sql/test_binop_with_alias_still_parenthesized/out.sql

@@ -0,0 +1,5 @@
+SELECT
+  (
+    "t0"."a" + "t0"."b"
+  ) * "t0"."c" AS "x"
+FROM "t" AS "t0"

ibis/backends/tests/sql/test_compiler.py

@@ -196,7 +196,7 @@ def test_subquery_where_location(snapshot):
         ],
         name="alltypes",
     )
-    param = ibis.param("timestamp").name("my_param")
+    param = ibis.param("timestamp")
     expr = (
         t[["float_col", "timestamp_col", "int_col", "string_col"]][
             lambda t: t.timestamp_col < param

ibis/backends/tests/sql/test_sql.py

@@ -143,6 +143,12 @@ def test_binop_parens(snapshot, opname, dtype, associative):
     snapshot.assert_match(combined, "out.sql")
 
 
+def test_binop_with_alias_still_parenthesized(snapshot):
+    t = ibis.table({"a": "int", "b": "int", "c": "int"}, name="t")
+    sql = to_sql(((t.a + t.b).name("d") * t.c).name("x"))
+    snapshot.assert_match(sql, "out.sql")
+
+
 @pytest.mark.parametrize(
     "expr_fn",
     [

ibis/expr/operations/relations.py

@@ -498,6 +498,7 @@ class TableUnnest(Relation):
 
     parent: Relation
     column: Value[dt.Array]
+    column_name: str
     offset: typing.Union[str, None]
     keep_empty: bool
 
@@ -507,15 +508,11 @@ def values(self):
 
     @attribute
     def schema(self):
-        column = self.column
-        offset = self.offset
-
         base = self.parent.schema.fields.copy()
+        base[self.column_name] = self.column.dtype.value_type
 
-        base[column.name] = column.dtype.value_type
-
-        if offset is not None:
-            base[offset] = dt.int64
+        if self.offset is not None:
+            base[self.offset] = dt.int64
 
         return Schema(base)
 

ibis/expr/types/relations.py

@@ -4890,7 +4890,11 @@ def unnest(
         """
         (column,) = self.bind(column)
         return ops.TableUnnest(
-            parent=self, column=column, offset=offset, keep_empty=keep_empty
+            parent=self,
+            column=column,
+            column_name=column.get_name(),
+            offset=offset,
+            keep_empty=keep_empty,
         ).to_expr()