Stanislav Lukyanov created IGNITE-9651:
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Summary: Binary objects comparison may fail when the same
reference occurs more than once
Key: IGNITE-9651
URL: https://issues.apache.org/jira/browse/IGNITE-9651
Project: Ignite
Issue Type: Bug
Components: binary
Reporter: Stanislav Lukyanov
Attachments: RepeatingFieldSqlTest.java, RepeatingFieldTest.java
If a composite object contains multiple occurrences of the same POJO that POJO
will be properly serialized only the first time, and all other references will
refer to that first object. Because of that the same object may have different
views in binary format when serialized on its own and when serialized as a part
of another object.
Having multiple binary views of the same object leads to several issues with
binary objects comparison. Examples in pseudocode are below, JUnit tests are
attached
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Example 1 (RepeatingFieldTest.java)
{code}
class Key { int i, Pojo pojo1, Pojo pojo2 }
class Pojo { int i }
cache.put(new Key(42, new Pojo(42), new Pojo(42)), 42);
// new Pojo is created for both fields - works
assertEquals(INT, cache.get(new Key(42, new Pojo(42), new Pojo(42))));
// same Pojo is used for both fields - fails
// this is because the second field is serialized as a reference to the first
one, and binary representation differs
Pojo obj = new Pojo(42);
assertEquals(42, cache.get(new Key(42, obj, obj)));
{code}
========================
Example 2 (RepeatingFieldSqlTest.java)
{code}
class Pojo { int i }
class Key { int i, Pojo pojo }
class Value { Pojo pojo, Key key }
Pojo obj = new Pojo(INT);
Key key = new Key(INT, obj);
Value val = new Value(key, obj);
cache.put(key, val);
// supposed to return 1 row, but returns 0
SqlFieldsQuery qry = new SqlFieldsQuery("select * from Value where _key = key");
{code}
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