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https://issues.apache.org/jira/browse/DRILL-425?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Steven Phillips updated DRILL-425:
----------------------------------
Attachment: DRILL-425.patch
> mock-sub-scan is not setting 'lastSet' in NullableVarCharVector or
> NullableVar16CharVector
> ------------------------------------------------------------------------------------------
>
> Key: DRILL-425
> URL: https://issues.apache.org/jira/browse/DRILL-425
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Venki Korukanti
> Assignee: Steven Phillips
> Attachments: DRILL-425.patch
>
>
> Following plan outputs empty values for nullableStr1 column after 1st row.
> {code}
> {
> head:{
> type:"APACHE_DRILL_PHYSICAL",
> version:"1",
> generator:{
> type:"manual"
> }
> },
> graph:[
> {
> @id:1,
> pop:"mock-sub-scan",
> url: "http://apache.org";,
> entries:[
> {records: 100, types: [
> {name: "nullableStr1", type: "VARCHAR", mode: "OPTIONAL"}
> ]}
> ]
> },
> {
> @id:2,
> child: 1,
> pop:"project",
> exprs: [
> { ref: "nullableStr1", expr: "nullableStr1" }
> ]
> },
> {
> @id: 3,
> child: 2,
> pop: "screen"
> }
> ]
> }
> {code}
> After transferring the ValueVector from 'scan' to 'project',
> ProjectRecordBatch calls NullableVarCharVector.setValueCount. As part of this
> method, all records from "lastSet +1" to "count" are set to empty byte array,
> because 'lastSet' is not set as part of the mock-sub-scan (default to 0), all
> but the first record have empty string data.
> {code}
> public void setValueCount(int valueCount) {
> .....
> for (int i = lastSet + 1; i < valueCount; i++) {
> values.getMutator().set(i, new byte[]{});
> }
> ....
> }
> {code}
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