implement eq_null_match_op

Author: chelsea-lin

bigframes/core/compile/sqlglot/expressions/binary_compiler.py

@@ -84,6 +84,26 @@ def _(op, left: TypedExpr, right: TypedExpr) -> sge.Expression:
     return sge.EQ(this=left_expr, expression=right_expr)
 
 
+@BINARY_OP_REGISTRATION.register(ops.eq_null_match_op)
+def _(op, left: TypedExpr, right: TypedExpr) -> sge.Expression:
+    left_expr = left.expr
+    if left.dtype == dtypes.BOOL_DTYPE and right.dtype != dtypes.BOOL_DTYPE:
+        left_expr = sge.Cast(this=left_expr, to="INT64")
+
+    right_expr = right.expr
+    if right.dtype == dtypes.BOOL_DTYPE and left.dtype != dtypes.BOOL_DTYPE:
+        right_expr = sge.Cast(this=right_expr, to="INT64")
+
+    sentinel = sge.convert("$NULL_SENTINEL$")
+    left_coalesce = sge.Coalesce(
+        this=sge.Cast(this=left_expr, to="STRING"), expressions=[sentinel]
+    )
+    right_coalesce = sge.Coalesce(
+        this=sge.Cast(this=right_expr, to="STRING"), expressions=[sentinel]
+    )
+    return sge.EQ(this=left_coalesce, expression=right_coalesce)
+
+
 @BINARY_OP_REGISTRATION.register(ops.div_op)
 def _(op, left: TypedExpr, right: TypedExpr) -> sge.Expression:
     left_expr = left.expr

tests/unit/core/compile/sqlglot/expressions/snapshots/test_binary_compiler/test_eq_null_match/out.sql

@@ -0,0 +1,14 @@
+WITH `bfcte_0` AS (
+  SELECT
+    `bool_col` AS `bfcol_0`,
+    `int64_col` AS `bfcol_1`
+  FROM `bigframes-dev`.`sqlglot_test`.`scalar_types`
+), `bfcte_1` AS (
+  SELECT
+    *,
+    COALESCE(CAST(`bfcol_1` AS STRING), '$NULL_SENTINEL$') = COALESCE(CAST(CAST(`bfcol_0` AS INT64) AS STRING), '$NULL_SENTINEL$') AS `bfcol_4`
+  FROM `bfcte_0`
+)
+SELECT
+  `bfcol_4` AS `int64_col`
+FROM `bfcte_1`

tests/unit/core/compile/sqlglot/expressions/test_binary_compiler.py

@@ -102,6 +102,12 @@ def test_div_timedelta(scalar_types_df: bpd.DataFrame, snapshot):
     snapshot.assert_match(bf_df.sql, "out.sql")
 
 
+def test_eq_null_match(scalar_types_df: bpd.DataFrame, snapshot):
+    bf_df = scalar_types_df[["int64_col", "bool_col"]]
+    sql = _apply_binary_op(bf_df, ops.eq_null_match_op, "int64_col", "bool_col")
+    snapshot.assert_match(sql, "out.sql")
+
+
 def test_json_set(json_types_df: bpd.DataFrame, snapshot):
     bf_df = json_types_df[["json_col"]]
     sql = _apply_binary_op(