feat: NTZ

butterfree/constants/data_type.py

@@ -12,6 +12,7 @@
     IntegerType,
     LongType,
     StringType,
+    TimestampNTZType,
     TimestampType,
 )
 from typing_extensions import final
@@ -21,6 +22,7 @@
 class DataType(Enum):
     """Holds constants for data types within Butterfree."""
 
+    TIMESTAMP_NTZ = (TimestampNTZType(), "timestamp", "TIMESTAMP_NTZ")
     TIMESTAMP = (TimestampType(), "timestamp", "TIMESTAMP")
     BINARY = (BinaryType(), "boolean", "BINARY")
     BOOLEAN = (BooleanType(), "boolean", "BOOLEAN")

butterfree/transform/features/timestamp_feature.py

@@ -41,6 +41,7 @@ class TimestampFeature(Feature):
 
     def __init__(
         self,
+        dtype: Optional[DataType] = DataType.TIMESTAMP,
         from_column: Optional[str] = None,
         transformation: Optional[TransformComponent] = None,
         from_ms: bool = False,
@@ -51,7 +52,7 @@ def __init__(
             name=TIMESTAMP_COLUMN,
             description=description,
             from_column=from_column,
-            dtype=DataType.TIMESTAMP,
+            dtype=dtype,
             transformation=transformation,
         )
         self.from_ms = from_ms

tests/integration/butterfree/pipelines/test_feature_set_pipeline.py

@@ -50,7 +50,7 @@ def create_temp_view(dataframe: DataFrame, name):
 
 
 def create_db_and_table(spark, table_reader_id, table_reader_db, table_reader_table):
-    spark.sql(f"drop schema {table_reader_db} cascade")
+    spark.sql(f"drop schema if exists {table_reader_db} cascade")
     spark.sql(f"create database {table_reader_db}")
     spark.sql(f"use {table_reader_db}")
     spark.sql(

tests/unit/butterfree/transform/features/test_timestamp_feature.py

@@ -1,18 +1,25 @@
-from pyspark.sql.types import StringType
+from datetime import datetime
 
+from pyspark.sql.types import StringType, StructField, StructType
+
+from butterfree.clients import SparkClient
 from butterfree.constants import DataType
 from butterfree.constants.columns import TIMESTAMP_COLUMN
 from butterfree.transform.features import TimestampFeature
 
+# from pyspark.sql.types import *
+
 
 class TestTimestampFeature:
     def test_args_without_transformation(self):
 
         test_key = TimestampFeature(from_column="ts")
+        test_key_ntz = TimestampFeature(dtype=DataType.TIMESTAMP_NTZ, from_column="ts")
 
         assert test_key.name == TIMESTAMP_COLUMN
         assert test_key.from_column == "ts"
         assert test_key.dtype == DataType.TIMESTAMP
+        assert test_key_ntz.dtype == DataType.TIMESTAMP_NTZ
 
     def test_transform(self, feature_set_dataframe):
 
@@ -70,3 +77,43 @@ def test_transform_mask(self, feature_set_dataframe_date):
 
         assert df[0]["timestamp"] == "2020-02-07 00:00:00"
         assert df[1]["timestamp"] == "2020-02-08 00:00:00"
+
+    def test_no_timezone(self):
+
+        spark = SparkClient()
+        now = datetime.now()
+
+        # Testing a new timezone
+        spark.conn.conf.set("spark.sql.session.timeZone", "GMT-5")
+
+        l = [(now, now)]
+        rdd = spark.conn.sparkContext.parallelize(l)
+
+        schema = StructType(
+            [
+                StructField("ts", DataType.TIMESTAMP.spark, True),
+                StructField("ts_ntz", DataType.TIMESTAMP_NTZ.spark, True),
+            ]
+        )
+        df = spark.conn.createDataFrame(rdd, schema)
+        df.createOrReplaceTempView("temp_tz_table")
+
+        df1 = spark.conn.sql("""SELECT ts, ts_ntz FROM temp_tz_table""")
+        df2 = df1.withColumns(
+            {"ts": df1.ts.cast(StringType()), "ts_ntz": df1.ts_ntz.cast(StringType())}
+        )
+        df2_vals = df2.collect()[0]
+
+        assert df2_vals.ts != df2_vals.ts_ntz
+
+        # New timezone, the column with TZ must have a different value, and the column NTZ must keep its value
+        spark.conn.conf.set("spark.sql.session.timeZone", "GMT-7")
+
+        df3 = spark.conn.sql("""SELECT ts, ts_ntz FROM temp_tz_table""")
+        df4 = df3.withColumns(
+            {"ts": df1.ts.cast(StringType()), "ts_ntz": df1.ts_ntz.cast(StringType())}
+        )
+        df4_vals = df4.collect()[0]
+
+        assert df4_vals.ts != df2_vals.ts
+        assert df4_vals.ts_ntz == df2_vals.ts_ntz