enable decimal to decimal and enable castoptions to be passed

use a regex to match arrow invalid argument error.
himadripal · Feb 11, 2025 · a2689a3 · a2689a3
1 parent f099e6e
commit a2689a3
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Showing 3 changed files with 23 additions and 12 deletions.
diff --git a/native/spark-expr/src/conversion_funcs/cast.rs b/native/spark-expr/src/conversion_funcs/cast.rs
@@ -872,6 +872,13 @@ fn cast_array(
     let array = array_with_timezone(array, cast_options.timezone.clone(), Some(to_type))?;
     let from_type = array.data_type().clone();
 
+    let native_cast_options: CastOptions = CastOptions {
+        safe: !matches!(cast_options.eval_mode, EvalMode::Ansi), // take safe mode from cast_options passed
+        format_options: FormatOptions::new()
+            .with_timestamp_tz_format(TIMESTAMP_FORMAT)
+            .with_timestamp_format(TIMESTAMP_FORMAT),
+    };
+
     let array = match &from_type {
         Dictionary(key_type, value_type)
             if key_type.as_ref() == &Int32
@@ -963,7 +970,7 @@ fn cast_array(
             || is_datafusion_spark_compatible(from_type, to_type, cast_options.allow_incompat) =>
         {
             // use DataFusion cast only when we know that it is compatible with Spark
-            Ok(cast_with_options(&array, to_type, &CAST_OPTIONS)?)
+            Ok(cast_with_options(&array, to_type, &native_cast_options)?)
         }
         _ => {
             // we should never reach this code because the Scala code should be checking

diff --git a/spark/src/main/scala/org/apache/comet/expressions/CometCast.scala b/spark/src/main/scala/org/apache/comet/expressions/CometCast.scala
@@ -70,13 +70,8 @@ object CometCast {
           case _ =>
             Unsupported
         }
-      case (from: DecimalType, to: DecimalType) =>
-        if (to.precision < from.precision) {
-          // https://github.com/apache/datafusion/issues/13492
-          Incompatible(Some("Casting to smaller precision is not supported"))
-        } else {
-          Compatible()
-        }
+      case (_: DecimalType, _: DecimalType) =>
+        Compatible()
       case (DataTypes.StringType, _) =>
         canCastFromString(toType, timeZoneId, evalMode)
       case (_, DataTypes.StringType) =>

diff --git a/spark/src/test/scala/org/apache/comet/CometCastSuite.scala b/spark/src/test/scala/org/apache/comet/CometCastSuite.scala
@@ -913,8 +913,8 @@ class CometCastSuite extends CometTestBase with AdaptiveSparkPlanHelper {
     val values = Seq(BigDecimal("12345.6789"), BigDecimal("9876.5432"), BigDecimal("123.4567"))
     val df = withNulls(values)
       .toDF("b")
-      .withColumn("a", col("b").cast(DecimalType(6, 2)))
-    checkSparkAnswer(df)
+      .withColumn("a", col("b").cast(DecimalType(38, 28)))
+    castTest(df, DecimalType(6, 2))
   }
 
   test("cast between decimals with higher precision than source") {
@@ -1133,8 +1133,17 @@ class CometCastSuite extends CometTestBase with AdaptiveSparkPlanHelper {
                     .replace(".WITH_SUGGESTION] ", "]")
                     .startsWith(cometMessage))
               } else if (CometSparkSessionExtensions.isSpark34Plus) {
-                // for Spark 3.4 we expect to reproduce the error message exactly
-                assert(cometMessage == sparkMessage)
+                // for comet decimal conversion throws ArrowError(string) from arrow
+                if (cometMessage.contains("Invalid argument error")) {
+                  val regex =
+                    "\\[\\[?(NUMERIC_VALUE_OUT_OF_RANGE|Invalid argument error)\\]?:? .*? (\\d+(\\.\\d+)?) .*? Decimal\\(?(\\d+),?\\s?(\\d+)\\)?.*?\\]?"
+                  assert(cometMessage.matches(regex) == sparkMessage.matches(regex))
+
+                } else {
+                  // for Spark 3.4 we expect to reproduce the error message exactly
+                  assert(cometMessage == sparkMessage)
+
+                }
               } else {
                 // for Spark 3.3 we just need to strip the prefix from the Comet message
                 // before comparing