feat(oracle): implement mode aggregation (#9914)

Author: cpcloud

ibis/backends/sql/compilers/oracle.py

@@ -57,7 +57,6 @@ class OracleCompiler(SQLGlotCompiler):
         ops.ArrayFlatten,
         ops.ArrayMap,
         ops.ArrayStringJoin,
-        ops.Mode,
         ops.MultiQuantile,
         ops.RegexSplit,
         ops.StringSplit,
@@ -89,6 +88,7 @@ class OracleCompiler(SQLGlotCompiler):
         ops.RPad: "rpad",
         ops.StringAscii: "ascii",
         ops.Strip: "trim",
+        ops.Mode: "stats_mode",
     }
 
     @staticmethod

ibis/backends/tests/test_aggregation.py

@@ -93,7 +93,6 @@ def mean_udf(s):
                     "pyspark",
                     "trino",
                     "druid",
-                    "oracle",
                     "flink",
                     "risingwave",
                     "exasol",
@@ -391,7 +390,6 @@ def mean_and_std(v):
                         "mssql",
                         "trino",
                         "druid",
-                        "oracle",
                         "exasol",
                         "flink",
                         "risingwave",

ibis/backends/tests/test_generic.py

@@ -715,7 +715,7 @@ def test_order_by_two_cols_nulls(con, op1, nf1, nf2, op2, expected):
         getattr(t["col2"], op2)(nulls_first=nf2),
     )
 
-    if (con.name in ("pandas", "dask")) and (nf1 != nf2):
+    if con.name in ("pandas", "dask") and nf1 != nf2:
         with pytest.raises(
             ValueError,
             match=f"{con.name} does not support specifying null ordering for individual column",
@@ -769,23 +769,11 @@ def test_table_info_large(con):
 
 
 @pytest.mark.notimpl(
-    [
-        "datafusion",
-        "bigquery",
-        "impala",
-        "mysql",
-        "mssql",
-        "trino",
-        "flink",
-    ],
+    ["datafusion", "bigquery", "impala", "mysql", "mssql", "trino", "flink"],
     raises=com.OperationNotDefinedError,
     reason="quantile and mode is not supported",
 )
-@pytest.mark.notimpl(
-    ["druid"],
-    raises=com.OperationNotDefinedError,
-    reason="Mode and StandardDev is not supported",
-)
+@pytest.mark.notimpl(["druid"], raises=com.OperationNotDefinedError)
 @pytest.mark.notyet(
     ["druid"],
     raises=PyDruidProgrammingError,
@@ -895,31 +883,17 @@ def test_table_info_large(con):
         ),
         param(
             s.of_type("string"),
-            [
-                "name",
-                "pos",
-                "type",
-                "count",
-                "nulls",
-                "unique",
-                "mode",
-            ],
+            ["name", "pos", "type", "count", "nulls", "unique", "mode"],
             marks=[
                 pytest.mark.notimpl(
-                    [
-                        "clickhouse",
-                        "exasol",
-                        "impala",
-                        "pyspark",
-                        "risingwave",
-                    ],
+                    ["clickhouse", "exasol", "impala", "pyspark", "risingwave"],
                     raises=com.OperationNotDefinedError,
                     reason="mode is not supported",
                 ),
                 pytest.mark.notimpl(
                     ["oracle"],
-                    raises=com.OperationNotDefinedError,
-                    reason="Mode is not supported and ORA-02000: missing AS keyword",
+                    raises=OracleDatabaseError,
+                    reason="ORA-02000: missing AS keyword",
                 ),
                 pytest.mark.notimpl(
                     ["dask"],
@@ -941,33 +915,18 @@ def test_table_describe(alltypes, selector, expected_columns):
 
 
 @pytest.mark.notimpl(
-    [
-        "datafusion",
-        "bigquery",
-        "impala",
-        "mysql",
-        "mssql",
-        "trino",
-        "flink",
-        "sqlite",
-    ],
+    ["datafusion", "bigquery", "impala", "mysql", "mssql", "trino", "flink", "sqlite"],
     raises=com.OperationNotDefinedError,
     reason="quantile is not supported",
 )
-@pytest.mark.notimpl(
-    ["druid"],
-    raises=com.OperationNotDefinedError,
-    reason="StandardDev is not supported",
-)
+@pytest.mark.notimpl(["druid"], raises=com.OperationNotDefinedError)
 @pytest.mark.notyet(
     ["druid"],
     raises=PyDruidProgrammingError,
     reason="Druid only supports trivial unions",
 )
 @pytest.mark.notyet(
-    ["oracle"],
-    raises=OracleDatabaseError,
-    reason="Mode is not supported and ORA-02000: missing AS keyword",
+    ["oracle"], raises=OracleDatabaseError, reason="ORA-02000: missing AS keyword"
 )
 def test_table_describe_large(con):
     num_cols = 129