Convert to Java Strings only for sketch metric columns of StringType #45
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| value = new String(((UTF8String) value).getBytes(), StandardCharsets.UTF_8); | ||
| if (value != null && segmentSpec.getComplexMetricColumns().contains(columnName) && sqlType == DataTypes.StringType) { | ||
| // Convert to Java String as Spark return UTF8String which is not compatible with Druid sketches. | ||
| value = value.toString(); |
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value here when the field is StringType is of instance https://spark.apache.org/docs/1.4.0/api/java/org/apache/spark/sql/types/UTF8String.html.
The change here is coerce it to Java string
https://spark.apache.org/docs/1.4.0/api/java/org/apache/spark/sql/types/UTF8String.html#toString()
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calling toString() on UTF8String object is same as the previous code.
I changed to toString() to simplify the code to avoid checking if object is instance of UTF8String.
juhoautio-rovio
approved these changes
Sep 25, 2023
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PR avoids the performance degradation due to too many object creation as noticed in #44.
With this change, only String metric columns used in sketches are converted to Java String type.