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[SPARK-53659][SQL] Infer Variant shredding schema when writing to Parquet #52406

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[SPARK-53659][SQL] Infer Variant shredding schema when writing to Parquet #52406

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0076f55
Infer shredding for parquet
cashmand Sep 22, 2025
c492a6c
Cleanup
cashmand Sep 22, 2025
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5 changes: 5 additions & 0 deletions common/variant/src/main/java/org/apache/spark/types/variant/Variant.java
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Original file line number Diff line number Diff line change
Expand Up @@ -99,6 +99,11 @@ public BigDecimal getDecimal() {
return VariantUtil.getDecimal(value, pos);
}

// Get the decimal value, including trailing zeros
public BigDecimal getDecimalWithOriginalScale() {
return VariantUtil.getDecimalWithOriginalScale(value, pos);
}

// Get a float value from the variant.
public float getFloat() {
return VariantUtil.getFloat(value, pos);
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25 changes: 25 additions & 0 deletions sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
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Expand Up @@ -5343,6 +5343,31 @@ object SQLConf {
.stringConf
.createWithDefault("")

val VARIANT_SHREDDING_MAX_SCHEMA_WIDTH =
buildConf("spark.sql.variant.shredding.maxSchemaWidth")
.internal()
.doc("Maximum number of shredded fields to create when inferring a schema for Variant")
.version("4.2.0")
.intConf
.createWithDefault(300)

val VARIANT_SHREDDING_MAX_SCHEMA_DEPTH =
buildConf("spark.sql.variant.shredding.maxSchemaDepth")
.internal()
.doc("Maximum depth in Variant value to traverse when inferring a schema. " +
"Any array/object below this depth will be shredded as a single binary.")
.version("4.2.0")
.intConf
.createWithDefault(50)

val VARIANT_INFER_SHREDDING_SCHEMA =
buildConf("spark.sql.variant.inferShreddingSchema")
.internal()
.doc("Infer shredding schema when writing Variant columns in Parquet tables.")
.version("4.2.0")
.booleanConf
.createWithDefault(false)

val LEGACY_CSV_ENABLE_DATE_TIME_PARSING_FALLBACK =
buildConf("spark.sql.legacy.csv.enableDateTimeParsingFallback")
.internal()
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