GeoStBufferOp compiler

Author: chelsea-lin

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

@@ -262,6 +262,17 @@ def _(op: ops.base_ops.UnaryOp, expr: TypedExpr) -> sge.Expression:
     return sge.func("ST_BOUNDARY", expr.expr)
 
 
+@UNARY_OP_REGISTRATION.register(ops.GeoStBufferOp)
+def _(op: ops.GeoStBufferOp, expr: TypedExpr) -> sge.Expression:
+    return sge.func(
+        "ST_BUFFER",
+        expr.expr,
+        sge.convert(op.buffer_radius),
+        sge.convert(op.num_seg_quarter_circle),
+        sge.convert(op.use_spheroid),
+    )
+
+
 @UNARY_OP_REGISTRATION.register(ops.geo_st_geogfromtext_op)
 def _(op: ops.base_ops.UnaryOp, expr: TypedExpr) -> sge.Expression:
     return sge.func("SAFE.ST_GEOGFROMTEXT", expr.expr)

tests/unit/core/compile/sqlglot/expressions/snapshots/test_unary_compiler/test_geo_st_buffer/out.sql

@@ -0,0 +1,13 @@
+WITH `bfcte_0` AS (
+  SELECT
+    `geography_col` AS `bfcol_0`
+  FROM `bigframes-dev`.`sqlglot_test`.`scalar_types`
+), `bfcte_1` AS (
+  SELECT
+    *,
+    ST_BUFFER(`bfcol_0`, 1.0, 8.0, FALSE) AS `bfcol_1`
+  FROM `bfcte_0`
+)
+SELECT
+  `bfcol_1` AS `geography_col`
+FROM `bfcte_1`

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

@@ -174,6 +174,13 @@ def test_geo_st_boundary(scalar_types_df: bpd.DataFrame, snapshot):
     snapshot.assert_match(sql, "out.sql")
 
 
+def test_geo_st_buffer(scalar_types_df: bpd.DataFrame, snapshot):
+    bf_df = scalar_types_df[["geography_col"]]
+    sql = _apply_unary_op(bf_df, ops.GeoStBufferOp(1.0, 8.0, False), "geography_col")
+
+    snapshot.assert_match(sql, "out.sql")
+
+
 def test_geo_st_geogfromtext(scalar_types_df: bpd.DataFrame, snapshot):
     bf_df = scalar_types_df[["string_col"]]
     sql = _apply_unary_op(bf_df, ops.geo_st_geogfromtext_op, "string_col")