[SPARK-49451][FOLLOW-UP] Add support for duplicate keys in from_json(…

…_, 'variant')

### What changes were proposed in this pull request?

This PR adds support for duplicate key support in the `from_json(_, 'variant')` query pattern. Duplicate key support [has been introduced](#47920) in `parse_json`, json scans and the `from_json` expressions with nested schemas but this code path was not updated.

### Why are the changes needed?

This change makes the behavior of `from_json(_, 'variant')` consistent with every other variant construction expression.

### Does this PR introduce _any_ user-facing change?

It potentially allows users to use the `from_json(<input>, 'variant')` expression on json inputs with duplicate keys depending on a config.

### How was this patch tested?

Unit tests.

### Was this patch authored or co-authored using generative AI tooling?

No.

Closes #48177 from harshmotw-db/harshmotw-db/master.

Authored-by: Harsh Motwani <harsh.motwani@databricks.com>
Signed-off-by: Hyukjin Kwon <gurwls223@apache.org>

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/jsonExpressions.scala

@@ -632,7 +632,8 @@ case class JsonToStructs(
     schema: DataType,
     options: Map[String, String],
     child: Expression,
-    timeZoneId: Option[String] = None)
+    timeZoneId: Option[String] = None,
+    variantAllowDuplicateKeys: Boolean = SQLConf.get.getConf(SQLConf.VARIANT_ALLOW_DUPLICATE_KEYS))
   extends UnaryExpression
   with TimeZoneAwareExpression
   with CodegenFallback
@@ -719,7 +720,8 @@ case class JsonToStructs(
 
   override def nullSafeEval(json: Any): Any = nullableSchema match {
     case _: VariantType =>
-      VariantExpressionEvalUtils.parseJson(json.asInstanceOf[UTF8String])
+      VariantExpressionEvalUtils.parseJson(json.asInstanceOf[UTF8String],
+        allowDuplicateKeys = variantAllowDuplicateKeys)
     case _ =>
       converter(parser.parse(json.asInstanceOf[UTF8String]))
   }
@@ -737,6 +739,12 @@ case class JsonToStructs(
     copy(child = newChild)
 }
 
+object JsonToStructs {
+  def unapply(
+      j: JsonToStructs): Option[(DataType, Map[String, String], Expression, Option[String])] =
+    Some((j.schema, j.options, j.child, j.timeZoneId))
+}
+
 /**
  * Converts a [[StructType]], [[ArrayType]] or [[MapType]] to a JSON output string.
  */

sql/connect/common/src/test/resources/query-tests/explain-results/function_from_json.explain

@@ -1,2 +1,2 @@
-Project [from_json(StructField(id,LongType,true), StructField(a,IntegerType,true), StructField(b,DoubleType,true), g#0, Some(America/Los_Angeles)) AS from_json(g)#0]
+Project [from_json(StructField(id,LongType,true), StructField(a,IntegerType,true), StructField(b,DoubleType,true), g#0, Some(America/Los_Angeles), false) AS from_json(g)#0]
 +- LocalRelation <empty>, [id#0L, a#0, b#0, d#0, e#0, f#0, g#0]

sql/connect/common/src/test/resources/query-tests/explain-results/function_from_json_orphaned.explain

@@ -1,2 +1,2 @@
-Project [from_json(StructField(id,LongType,true), StructField(a,IntegerType,true), StructField(b,DoubleType,true), g#0, Some(America/Los_Angeles)) AS from_json(g)#0]
+Project [from_json(StructField(id,LongType,true), StructField(a,IntegerType,true), StructField(b,DoubleType,true), g#0, Some(America/Los_Angeles), false) AS from_json(g)#0]
 +- LocalRelation <empty>, [id#0L, a#0, b#0, d#0, e#0, f#0, g#0]

sql/connect/common/src/test/resources/query-tests/explain-results/function_from_json_with_json_schema.explain

@@ -1,2 +1,2 @@
-Project [from_json(StructField(id,LongType,true), StructField(a,IntegerType,true), StructField(b,DoubleType,true), g#0, Some(America/Los_Angeles)) AS from_json(g)#0]
+Project [from_json(StructField(id,LongType,true), StructField(a,IntegerType,true), StructField(b,DoubleType,true), g#0, Some(America/Los_Angeles), false) AS from_json(g)#0]
 +- LocalRelation <empty>, [id#0L, a#0, b#0, d#0, e#0, f#0, g#0]

sql/core/src/test/resources/sql-tests/analyzer-results/ansi/date.sql.out

@@ -736,7 +736,7 @@ Project [to_date(26/October/2015, Some(dd/MMMMM/yyyy), Some(America/Los_Angeles)
 -- !query
 select from_json('{"d":"26/October/2015"}', 'd Date', map('dateFormat', 'dd/MMMMM/yyyy'))
 -- !query analysis
-Project [from_json(StructField(d,DateType,true), (dateFormat,dd/MMMMM/yyyy), {"d":"26/October/2015"}, Some(America/Los_Angeles)) AS from_json({"d":"26/October/2015"})#x]
+Project [from_json(StructField(d,DateType,true), (dateFormat,dd/MMMMM/yyyy), {"d":"26/October/2015"}, Some(America/Los_Angeles), false) AS from_json({"d":"26/October/2015"})#x]
 +- OneRowRelation
 
 

sql/core/src/test/resources/sql-tests/analyzer-results/ansi/interval.sql.out

@@ -2108,7 +2108,7 @@ SELECT
   to_csv(named_struct('a', interval 32 year, 'b', interval 10 month)),
   from_csv(to_csv(named_struct('a', interval 32 year, 'b', interval 10 month)), 'a interval year, b interval month')
 -- !query analysis
-Project [from_json(StructField(a,CalendarIntervalType,true), {"a":"1 days"}, Some(America/Los_Angeles)) AS from_json({"a":"1 days"})#x, from_csv(StructField(a,IntegerType,true), StructField(b,YearMonthIntervalType(0,0),true), 1, 1, Some(America/Los_Angeles), None) AS from_csv(1, 1)#x, to_json(from_json(StructField(a,CalendarIntervalType,true), {"a":"1 days"}, Some(America/Los_Angeles)), Some(America/Los_Angeles)) AS to_json(from_json({"a":"1 days"}))#x, to_csv(from_csv(StructField(a,IntegerType,true), StructField(b,YearMonthIntervalType(0,0),true), 1, 1, Some(America/Los_Angeles), None), Some(America/Los_Angeles)) AS to_csv(from_csv(1, 1))#x, to_csv(named_struct(a, INTERVAL '32' YEAR, b, INTERVAL '10' MONTH), Some(America/Los_Angeles)) AS to_csv(named_struct(a, INTERVAL '32' YEAR, b, INTERVAL '10' MONTH))#x, from_csv(StructField(a,YearMonthIntervalType(0,0),true), StructField(b,YearMonthIntervalType(1,1),true), to_csv(named_struct(a, INTERVAL '32' YEAR, b, INTERVAL '10' MONTH), Some(America/Los_Angeles)), Some(America/Los_Angeles), None) AS from_csv(to_csv(named_struct(a, INTERVAL '32' YEAR, b, INTERVAL '10' MONTH)))#x]
+Project [from_json(StructField(a,CalendarIntervalType,true), {"a":"1 days"}, Some(America/Los_Angeles), false) AS from_json({"a":"1 days"})#x, from_csv(StructField(a,IntegerType,true), StructField(b,YearMonthIntervalType(0,0),true), 1, 1, Some(America/Los_Angeles), None) AS from_csv(1, 1)#x, to_json(from_json(StructField(a,CalendarIntervalType,true), {"a":"1 days"}, Some(America/Los_Angeles), false), Some(America/Los_Angeles)) AS to_json(from_json({"a":"1 days"}))#x, to_csv(from_csv(StructField(a,IntegerType,true), StructField(b,YearMonthIntervalType(0,0),true), 1, 1, Some(America/Los_Angeles), None), Some(America/Los_Angeles)) AS to_csv(from_csv(1, 1))#x, to_csv(named_struct(a, INTERVAL '32' YEAR, b, INTERVAL '10' MONTH), Some(America/Los_Angeles)) AS to_csv(named_struct(a, INTERVAL '32' YEAR, b, INTERVAL '10' MONTH))#x, from_csv(StructField(a,YearMonthIntervalType(0,0),true), StructField(b,YearMonthIntervalType(1,1),true), to_csv(named_struct(a, INTERVAL '32' YEAR, b, INTERVAL '10' MONTH), Some(America/Los_Angeles)), Some(America/Los_Angeles), None) AS from_csv(to_csv(named_struct(a, INTERVAL '32' YEAR, b, INTERVAL '10' MONTH)))#x]
 +- OneRowRelation
 
 
@@ -2119,7 +2119,7 @@ SELECT
   to_json(map('a', interval 100 day 130 minute)),
   from_json(to_json(map('a', interval 100 day 130 minute)), 'a interval day to minute')
 -- !query analysis
-Project [from_json(StructField(a,DayTimeIntervalType(0,0),true), {"a":"1"}, Some(America/Los_Angeles)) AS from_json({"a":"1"})#x, to_json(from_json(StructField(a,DayTimeIntervalType(0,0),true), {"a":"1"}, Some(America/Los_Angeles)), Some(America/Los_Angeles)) AS to_json(from_json({"a":"1"}))#x, to_json(map(a, INTERVAL '100 02:10' DAY TO MINUTE), Some(America/Los_Angeles)) AS to_json(map(a, INTERVAL '100 02:10' DAY TO MINUTE))#x, from_json(StructField(a,DayTimeIntervalType(0,2),true), to_json(map(a, INTERVAL '100 02:10' DAY TO MINUTE), Some(America/Los_Angeles)), Some(America/Los_Angeles)) AS from_json(to_json(map(a, INTERVAL '100 02:10' DAY TO MINUTE)))#x]
+Project [from_json(StructField(a,DayTimeIntervalType(0,0),true), {"a":"1"}, Some(America/Los_Angeles), false) AS from_json({"a":"1"})#x, to_json(from_json(StructField(a,DayTimeIntervalType(0,0),true), {"a":"1"}, Some(America/Los_Angeles), false), Some(America/Los_Angeles)) AS to_json(from_json({"a":"1"}))#x, to_json(map(a, INTERVAL '100 02:10' DAY TO MINUTE), Some(America/Los_Angeles)) AS to_json(map(a, INTERVAL '100 02:10' DAY TO MINUTE))#x, from_json(StructField(a,DayTimeIntervalType(0,2),true), to_json(map(a, INTERVAL '100 02:10' DAY TO MINUTE), Some(America/Los_Angeles)), Some(America/Los_Angeles), false) AS from_json(to_json(map(a, INTERVAL '100 02:10' DAY TO MINUTE)))#x]
 +- OneRowRelation
 
 
@@ -2130,7 +2130,7 @@ SELECT
   to_json(map('a', interval 32 year 10 month)),
   from_json(to_json(map('a', interval 32 year 10 month)), 'a interval year to month')
 -- !query analysis
-Project [from_json(StructField(a,YearMonthIntervalType(0,0),true), {"a":"1"}, Some(America/Los_Angeles)) AS from_json({"a":"1"})#x, to_json(from_json(StructField(a,YearMonthIntervalType(0,0),true), {"a":"1"}, Some(America/Los_Angeles)), Some(America/Los_Angeles)) AS to_json(from_json({"a":"1"}))#x, to_json(map(a, INTERVAL '32-10' YEAR TO MONTH), Some(America/Los_Angeles)) AS to_json(map(a, INTERVAL '32-10' YEAR TO MONTH))#x, from_json(StructField(a,YearMonthIntervalType(0,1),true), to_json(map(a, INTERVAL '32-10' YEAR TO MONTH), Some(America/Los_Angeles)), Some(America/Los_Angeles)) AS from_json(to_json(map(a, INTERVAL '32-10' YEAR TO MONTH)))#x]
+Project [from_json(StructField(a,YearMonthIntervalType(0,0),true), {"a":"1"}, Some(America/Los_Angeles), false) AS from_json({"a":"1"})#x, to_json(from_json(StructField(a,YearMonthIntervalType(0,0),true), {"a":"1"}, Some(America/Los_Angeles), false), Some(America/Los_Angeles)) AS to_json(from_json({"a":"1"}))#x, to_json(map(a, INTERVAL '32-10' YEAR TO MONTH), Some(America/Los_Angeles)) AS to_json(map(a, INTERVAL '32-10' YEAR TO MONTH))#x, from_json(StructField(a,YearMonthIntervalType(0,1),true), to_json(map(a, INTERVAL '32-10' YEAR TO MONTH), Some(America/Los_Angeles)), Some(America/Los_Angeles), false) AS from_json(to_json(map(a, INTERVAL '32-10' YEAR TO MONTH)))#x]
 +- OneRowRelation
 
 

sql/core/src/test/resources/sql-tests/analyzer-results/ansi/parse-schema-string.sql.out

@@ -16,12 +16,12 @@ Project [from_csv(StructField(cube,IntegerType,true), 1, Some(America/Los_Angele
 -- !query
 select from_json('{"create":1}', 'create INT')
 -- !query analysis
-Project [from_json(StructField(create,IntegerType,true), {"create":1}, Some(America/Los_Angeles)) AS from_json({"create":1})#x]
+Project [from_json(StructField(create,IntegerType,true), {"create":1}, Some(America/Los_Angeles), false) AS from_json({"create":1})#x]
 +- OneRowRelation
 
 
 -- !query
 select from_json('{"cube":1}', 'cube INT')
 -- !query analysis
-Project [from_json(StructField(cube,IntegerType,true), {"cube":1}, Some(America/Los_Angeles)) AS from_json({"cube":1})#x]
+Project [from_json(StructField(cube,IntegerType,true), {"cube":1}, Some(America/Los_Angeles), false) AS from_json({"cube":1})#x]
 +- OneRowRelation

sql/core/src/test/resources/sql-tests/analyzer-results/ansi/timestamp.sql.out

@@ -730,7 +730,7 @@ Project [unix_timestamp(22 05 2020 Friday, dd MM yyyy EEEEE, Some(America/Los_An
 -- !query
 select from_json('{"t":"26/October/2015"}', 't Timestamp', map('timestampFormat', 'dd/MMMMM/yyyy'))
 -- !query analysis
-Project [from_json(StructField(t,TimestampType,true), (timestampFormat,dd/MMMMM/yyyy), {"t":"26/October/2015"}, Some(America/Los_Angeles)) AS from_json({"t":"26/October/2015"})#x]
+Project [from_json(StructField(t,TimestampType,true), (timestampFormat,dd/MMMMM/yyyy), {"t":"26/October/2015"}, Some(America/Los_Angeles), false) AS from_json({"t":"26/October/2015"})#x]
 +- OneRowRelation
 
 

sql/core/src/test/resources/sql-tests/analyzer-results/date.sql.out

@@ -811,7 +811,7 @@ Project [to_date(26/October/2015, Some(dd/MMMMM/yyyy), Some(America/Los_Angeles)
 -- !query
 select from_json('{"d":"26/October/2015"}', 'd Date', map('dateFormat', 'dd/MMMMM/yyyy'))
 -- !query analysis
-Project [from_json(StructField(d,DateType,true), (dateFormat,dd/MMMMM/yyyy), {"d":"26/October/2015"}, Some(America/Los_Angeles)) AS from_json({"d":"26/October/2015"})#x]
+Project [from_json(StructField(d,DateType,true), (dateFormat,dd/MMMMM/yyyy), {"d":"26/October/2015"}, Some(America/Los_Angeles), false) AS from_json({"d":"26/October/2015"})#x]
 +- OneRowRelation
 
 

sql/core/src/test/resources/sql-tests/analyzer-results/datetime-legacy.sql.out

@@ -811,7 +811,7 @@ Project [to_date(26/October/2015, Some(dd/MMMMM/yyyy), Some(America/Los_Angeles)
 -- !query
 select from_json('{"d":"26/October/2015"}', 'd Date', map('dateFormat', 'dd/MMMMM/yyyy'))
 -- !query analysis
-Project [from_json(StructField(d,DateType,true), (dateFormat,dd/MMMMM/yyyy), {"d":"26/October/2015"}, Some(America/Los_Angeles)) AS from_json({"d":"26/October/2015"})#x]
+Project [from_json(StructField(d,DateType,true), (dateFormat,dd/MMMMM/yyyy), {"d":"26/October/2015"}, Some(America/Los_Angeles), false) AS from_json({"d":"26/October/2015"})#x]
 +- OneRowRelation
 
 
@@ -1833,7 +1833,7 @@ Project [unix_timestamp(22 05 2020 Friday, dd MM yyyy EEEEE, Some(America/Los_An
 -- !query
 select from_json('{"t":"26/October/2015"}', 't Timestamp', map('timestampFormat', 'dd/MMMMM/yyyy'))
 -- !query analysis
-Project [from_json(StructField(t,TimestampType,true), (timestampFormat,dd/MMMMM/yyyy), {"t":"26/October/2015"}, Some(America/Los_Angeles)) AS from_json({"t":"26/October/2015"})#x]
+Project [from_json(StructField(t,TimestampType,true), (timestampFormat,dd/MMMMM/yyyy), {"t":"26/October/2015"}, Some(America/Los_Angeles), false) AS from_json({"t":"26/October/2015"})#x]
 +- OneRowRelation
 
 

sql/core/src/test/resources/sql-tests/analyzer-results/interval.sql.out

@@ -2108,7 +2108,7 @@ SELECT
   to_csv(named_struct('a', interval 32 year, 'b', interval 10 month)),
   from_csv(to_csv(named_struct('a', interval 32 year, 'b', interval 10 month)), 'a interval year, b interval month')
 -- !query analysis
-Project [from_json(StructField(a,CalendarIntervalType,true), {"a":"1 days"}, Some(America/Los_Angeles)) AS from_json({"a":"1 days"})#x, from_csv(StructField(a,IntegerType,true), StructField(b,YearMonthIntervalType(0,0),true), 1, 1, Some(America/Los_Angeles), None) AS from_csv(1, 1)#x, to_json(from_json(StructField(a,CalendarIntervalType,true), {"a":"1 days"}, Some(America/Los_Angeles)), Some(America/Los_Angeles)) AS to_json(from_json({"a":"1 days"}))#x, to_csv(from_csv(StructField(a,IntegerType,true), StructField(b,YearMonthIntervalType(0,0),true), 1, 1, Some(America/Los_Angeles), None), Some(America/Los_Angeles)) AS to_csv(from_csv(1, 1))#x, to_csv(named_struct(a, INTERVAL '32' YEAR, b, INTERVAL '10' MONTH), Some(America/Los_Angeles)) AS to_csv(named_struct(a, INTERVAL '32' YEAR, b, INTERVAL '10' MONTH))#x, from_csv(StructField(a,YearMonthIntervalType(0,0),true), StructField(b,YearMonthIntervalType(1,1),true), to_csv(named_struct(a, INTERVAL '32' YEAR, b, INTERVAL '10' MONTH), Some(America/Los_Angeles)), Some(America/Los_Angeles), None) AS from_csv(to_csv(named_struct(a, INTERVAL '32' YEAR, b, INTERVAL '10' MONTH)))#x]
+Project [from_json(StructField(a,CalendarIntervalType,true), {"a":"1 days"}, Some(America/Los_Angeles), false) AS from_json({"a":"1 days"})#x, from_csv(StructField(a,IntegerType,true), StructField(b,YearMonthIntervalType(0,0),true), 1, 1, Some(America/Los_Angeles), None) AS from_csv(1, 1)#x, to_json(from_json(StructField(a,CalendarIntervalType,true), {"a":"1 days"}, Some(America/Los_Angeles), false), Some(America/Los_Angeles)) AS to_json(from_json({"a":"1 days"}))#x, to_csv(from_csv(StructField(a,IntegerType,true), StructField(b,YearMonthIntervalType(0,0),true), 1, 1, Some(America/Los_Angeles), None), Some(America/Los_Angeles)) AS to_csv(from_csv(1, 1))#x, to_csv(named_struct(a, INTERVAL '32' YEAR, b, INTERVAL '10' MONTH), Some(America/Los_Angeles)) AS to_csv(named_struct(a, INTERVAL '32' YEAR, b, INTERVAL '10' MONTH))#x, from_csv(StructField(a,YearMonthIntervalType(0,0),true), StructField(b,YearMonthIntervalType(1,1),true), to_csv(named_struct(a, INTERVAL '32' YEAR, b, INTERVAL '10' MONTH), Some(America/Los_Angeles)), Some(America/Los_Angeles), None) AS from_csv(to_csv(named_struct(a, INTERVAL '32' YEAR, b, INTERVAL '10' MONTH)))#x]
 +- OneRowRelation
 
 
@@ -2119,7 +2119,7 @@ SELECT
   to_json(map('a', interval 100 day 130 minute)),
   from_json(to_json(map('a', interval 100 day 130 minute)), 'a interval day to minute')
 -- !query analysis
-Project [from_json(StructField(a,DayTimeIntervalType(0,0),true), {"a":"1"}, Some(America/Los_Angeles)) AS from_json({"a":"1"})#x, to_json(from_json(StructField(a,DayTimeIntervalType(0,0),true), {"a":"1"}, Some(America/Los_Angeles)), Some(America/Los_Angeles)) AS to_json(from_json({"a":"1"}))#x, to_json(map(a, INTERVAL '100 02:10' DAY TO MINUTE), Some(America/Los_Angeles)) AS to_json(map(a, INTERVAL '100 02:10' DAY TO MINUTE))#x, from_json(StructField(a,DayTimeIntervalType(0,2),true), to_json(map(a, INTERVAL '100 02:10' DAY TO MINUTE), Some(America/Los_Angeles)), Some(America/Los_Angeles)) AS from_json(to_json(map(a, INTERVAL '100 02:10' DAY TO MINUTE)))#x]
+Project [from_json(StructField(a,DayTimeIntervalType(0,0),true), {"a":"1"}, Some(America/Los_Angeles), false) AS from_json({"a":"1"})#x, to_json(from_json(StructField(a,DayTimeIntervalType(0,0),true), {"a":"1"}, Some(America/Los_Angeles), false), Some(America/Los_Angeles)) AS to_json(from_json({"a":"1"}))#x, to_json(map(a, INTERVAL '100 02:10' DAY TO MINUTE), Some(America/Los_Angeles)) AS to_json(map(a, INTERVAL '100 02:10' DAY TO MINUTE))#x, from_json(StructField(a,DayTimeIntervalType(0,2),true), to_json(map(a, INTERVAL '100 02:10' DAY TO MINUTE), Some(America/Los_Angeles)), Some(America/Los_Angeles), false) AS from_json(to_json(map(a, INTERVAL '100 02:10' DAY TO MINUTE)))#x]
 +- OneRowRelation
 
 
@@ -2130,7 +2130,7 @@ SELECT
   to_json(map('a', interval 32 year 10 month)),
   from_json(to_json(map('a', interval 32 year 10 month)), 'a interval year to month')
 -- !query analysis
-Project [from_json(StructField(a,YearMonthIntervalType(0,0),true), {"a":"1"}, Some(America/Los_Angeles)) AS from_json({"a":"1"})#x, to_json(from_json(StructField(a,YearMonthIntervalType(0,0),true), {"a":"1"}, Some(America/Los_Angeles)), Some(America/Los_Angeles)) AS to_json(from_json({"a":"1"}))#x, to_json(map(a, INTERVAL '32-10' YEAR TO MONTH), Some(America/Los_Angeles)) AS to_json(map(a, INTERVAL '32-10' YEAR TO MONTH))#x, from_json(StructField(a,YearMonthIntervalType(0,1),true), to_json(map(a, INTERVAL '32-10' YEAR TO MONTH), Some(America/Los_Angeles)), Some(America/Los_Angeles)) AS from_json(to_json(map(a, INTERVAL '32-10' YEAR TO MONTH)))#x]
+Project [from_json(StructField(a,YearMonthIntervalType(0,0),true), {"a":"1"}, Some(America/Los_Angeles), false) AS from_json({"a":"1"})#x, to_json(from_json(StructField(a,YearMonthIntervalType(0,0),true), {"a":"1"}, Some(America/Los_Angeles), false), Some(America/Los_Angeles)) AS to_json(from_json({"a":"1"}))#x, to_json(map(a, INTERVAL '32-10' YEAR TO MONTH), Some(America/Los_Angeles)) AS to_json(map(a, INTERVAL '32-10' YEAR TO MONTH))#x, from_json(StructField(a,YearMonthIntervalType(0,1),true), to_json(map(a, INTERVAL '32-10' YEAR TO MONTH), Some(America/Los_Angeles)), Some(America/Los_Angeles), false) AS from_json(to_json(map(a, INTERVAL '32-10' YEAR TO MONTH)))#x]
 +- OneRowRelation