feat: Add rewrite function for ops.FloorDivide (#85)

* feat: Add floor divide rewrite function

* chore: release v1.0.0 with latest fixes (#100)

* chore: release v1.0.0 with latest fixes

* update changelog

* update pyarrow dependency

* chore: add author

* chore: fix classifier

* restore rewrite

Co-authored-by: Timothy Dijamco <timothy.dijamco@twosigma.com>
Co-authored-by: Tim Swast <swast@google.com>

ibis_bigquery/rewrites.py

@@ -11,6 +11,11 @@ def bigquery_day_of_week_name(e):
     return arg.strftime("%A")
 
 
+def bq_floor_divide(expr):
+    left, right = expr.op().args
+    return left.div(right).floor()
+
+
 def identical_to(expr):
     left, right = expr.op().args
     return (left.isnull() & right.isnull()) | (left == right)
@@ -46,6 +51,7 @@ def bigquery_any_all_no_op(expr):
 REWRITES = {
     **sql_compiler.ExprTranslator._rewrites,
     ops.DayOfWeekName: bigquery_day_of_week_name,
+    ops.FloorDivide: bq_floor_divide,
     ops.IdenticalTo: identical_to,
     ops.Log2: log2,
     ops.Sum: bq_sum,

tests/system/test_compiler.py

@@ -70,6 +70,15 @@ def test_ieee_divide(alltypes, project_id, dataset_id):
     assert result == expected
 
 
+def test_floor_divide(alltypes, project_id, dataset_id):
+    expr = alltypes.double_col // 0
+    result = expr.compile()
+    expected = f"""\
+SELECT CAST(FLOOR(IEEE_DIVIDE(`double_col`, 0)) AS INT64) AS `tmp`
+FROM `{project_id}.{dataset_id}.functional_alltypes`"""
+    assert result == expected
+
+
 def test_identical_to(alltypes, project_id, dataset_id):
     t = alltypes
     pred = t.string_col.identical_to("a") & t.date_string_col.identical_to("b")