[IGNITE-7483] Queries: transformers are not executed when paging the result

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 2.3
• Fix Version/s: 2.5
• Component/s: cache
• Assignee: Vyacheslav Koptilin
• Reporter: Sascha Hofer
• Created: 22/Jan/18 08:21
• Updated: 15/Feb/18 16:47
• Resolved: 15/Feb/18 16:47

Description

It seems that transformers are not executed during pagination which leads to ClassCastExceptions because the result list also contains instances of GridCacheQueryResponseEntry.

To reproduce open GridCacheQueryTransformerSelfTest.testGetKeys() and set a page size of 1 so that

List<Integer> keys = cache.query(new ScanQuery<Integer, String>(), transformer).getAll();

becomes to

List<Integer> keys = cache.query(new ScanQuery<Integer, String>().setPageSize(1), transformer).getAll();

this leads to following stack trace:

java.lang.ClassCastException: org.apache.ignite.internal.processors.cache.query.GridCacheQueryResponseEntry cannot be cast to java.lang.Comparable

	at java.util.ComparableTimSort.binarySort(ComparableTimSort.java:249)
	at java.util.ComparableTimSort.sort(ComparableTimSort.java:207)
	at java.util.Arrays.sort(Arrays.java:1312)
	at java.util.Arrays.sort(Arrays.java:1506)
	at java.util.ArrayList.sort(ArrayList.java:1454)
	at java.util.Collections.sort(Collections.java:141)
	at org.apache.ignite.internal.processors.cache.query.GridCacheQueryTransformerSelfTest.testGetKeys(GridCacheQueryTransformerSelfTest.java:102)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at junit.framework.TestCase.runTest(TestCase.java:176)
	at org.apache.ignite.testframework.junits.GridAbstractTest.runTestInternal(GridAbstractTest.java:2001)
	at org.apache.ignite.testframework.junits.GridAbstractTest.access$000(GridAbstractTest.java:133)
	at org.apache.ignite.testframework.junits.GridAbstractTest$5.run(GridAbstractTest.java:1916)
	at java.lang.Thread.run(Thread.java:745)

Issue Links

• duplicates: IGNITE-5804 ScanQuery transformer applies to first results page only.