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[Backport 0.5-nexus] Add support for serializing MapType #938

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Nov 22, 2024
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[Backport 0.5-nexus] Add support for serializing MapType #938

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3 changes: 3 additions & 0 deletions ...-spark-integration/src/main/scala/org/apache/spark/sql/flint/datatype/FlintDataType.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -153,6 +153,9 @@ object FlintDataType {
// objects
case st: StructType => serializeJValue(st)

// Serialize maps as empty objects and let the map entries automap
case mt: MapType => serializeJValue(new StructType())

// array
case ArrayType(elementType, _) => serializeField(elementType, Metadata.empty)

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15 changes: 15 additions & 0 deletions ...k-integration/src/test/scala/org/apache/spark/sql/flint/datatype/FlintDataTypeSuite.scala
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Expand Up @@ -128,6 +128,21 @@ class FlintDataTypeSuite extends FlintSuite with Matchers {
|}""".stripMargin)
}

test("spark map type serialize") {
val sparkStructType = StructType(
StructField("mapField", MapType(StringType, StringType), true) ::
Nil)

FlintDataType.serialize(sparkStructType) shouldBe compactJson("""{
| "properties": {
| "mapField": {
| "properties": {
| }
| }
| }
|}""".stripMargin)
}

test("spark varchar and char type serialize") {
val flintDataType = """{
| "properties": {
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