[CARBONDATA-2982] CarbonSchemaReader don't support Array<string>

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.5.0
• Fix Version/s: 1.5.0
• Component/s: other
• Assignee: Bo Xu
• Reporter: Bo Xu
• Created: 28/Sep/18 03:40
• Updated: 03/Oct/18 10:52
• Resolved: 03/Oct/18 10:52

Description

CarbonSchemaReader don't support Array<string>
When we read schema from index file and the data include array<string> data type

run org.apache.carbondata.examples.sdk.CarbonReaderExample :

    Schema schema = CarbonSchemaReader
                .readSchemaInIndexFile(dataFiles[0].getAbsolutePath())
                .asOriginOrder();
            // Transform the schema
            String[] strings = new String[schema.getFields().length];
            for (int i = 0; i < schema.getFields().length; i++) {
                strings[i] = (schema.getFields())[i].getFieldName();
                System.out.println(strings[i] + "\t" + schema.getFields()[i].getSchemaOrdinal());
            }

and throw some exception:

log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
arrayfield.val0	-1
stringfield	0
shortfield	1
intfield	2
longfield	3
doublefield	4
boolfield	5
datefield	6
timefield	7
decimalfield	8
varcharfield	9
arrayfield	10
Complex child columns projection NOT supported through CarbonReader
java.lang.UnsupportedOperationException: Complex child columns projection NOT supported through CarbonReader
	at org.apache.carbondata.sdk.file.CarbonReaderBuilder.build(CarbonReaderBuilder.java:155)
	at org.apache.carbondata.examples.sdk.CarbonReaderExample.main(CarbonReaderExample.java:110)

It print arrayfield.val0 -1, child schema

Issue Links

• links to: GitHub Pull Request #2780