[GitHub] [spark] zhengruifeng commented on a diff in pull request #40376: [SPARK-42756][CONNECT][PYTHON] Helper function to convert proto literal to value in Python Client

["zhengruifeng (via GitHub)" <gi...@apache.org>]

zhengruifeng commented on code in PR #40376:
URL: https://github.com/apache/spark/pull/40376#discussion_r1133369721


##########
python/pyspark/sql/connect/expressions.py:
##########
@@ -308,6 +308,43 @@ def _infer_type(cls, value: Any) -> DataType:
     def _from_value(cls, value: Any) -> "LiteralExpression":
         return LiteralExpression(value=value, dataType=LiteralExpression._infer_type(value))
 
+    @classmethod
+    def _to_value(cls, literal: "proto.Expression.Literal") -> Any:
+        if literal.HasField("null"):
+            return None
+        elif literal.HasField("binary"):
+            return literal.binary
+        elif literal.HasField("boolean"):
+            return literal.boolean
+        elif literal.HasField("byte"):
+            return literal.byte
+        elif literal.HasField("short"):
+            return literal.short
+        elif literal.HasField("integer"):
+            return literal.integer
+        elif literal.HasField("long"):
+            return literal.long
+        elif literal.HasField("float"):
+            return literal.float
+        elif literal.HasField("double"):
+            return literal.double
+        elif literal.HasField("decimal"):
+            return decimal.Decimal(literal.decimal.value)
+        elif literal.HasField("string"):
+            return literal.string
+        elif literal.HasField("date"):
+            return DateType().fromInternal(literal.date)
+        elif literal.HasField("timestamp"):
+            return TimestampType().fromInternal(literal.timestamp)
+        elif literal.HasField("timestamp_ntz"):
+            return TimestampNTZType().fromInternal(literal.timestamp_ntz)
+        elif literal.HasField("day_time_interval"):
+            return DayTimeIntervalType().fromInternal(literal.day_time_interval)
+        elif literal.HasField("array"):
+            return [LiteralExpression._to_value(v) for v in literal.array.elements]

Review Comment:
   that is fine



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