Fix fetching varint values

[kornilova203]

Before the fix it was throwing IndexOutOfBoundsException

java.lang.IndexOutOfBoundsException
	at java.base/java.nio.Buffer.checkIndex(Buffer.java:749)
	at java.base/java.nio.HeapByteBuffer.getInt(HeapByteBuffer.java:439)
	at com.ing.data.cassandra.jdbc.utils.ByteBufferUtil.toInt(ByteBufferUtil.java:113)
	at com.ing.data.cassandra.jdbc.codec.VarintToIntCodec.decode(VarintToIntCodec.java:65)
	at com.ing.data.cassandra.jdbc.codec.VarintToIntCodec.decode(VarintToIntCodec.java:31)
	at com.datastax.oss.driver.api.core.data.GettableByIndex.get(GettableByIndex.java:90)
	at com.datastax.oss.driver.api.core.data.GettableByIndex.getInt(GettableByIndex.java:270)
	at com.ing.data.cassandra.jdbc.CassandraResultSet.getObject(CassandraResultSet.java:986)

[maximevw]

@kornilova203 Thanks for this finding! Good catch! I let you review my comment to improve this fix.

[maximevw]

You're right, it was incorrect to use getInt for varint type, but to be really correct, it will be even better to use getBigInteger instead of getObject.

The same fix should be applied at the following locations:

• cassandra-jdbc-wrapper/src/main/java/com/ing/data/cassandra/jdbc/CassandraResultSet.java

  Line 1117 in 35e47fe

  case VARINT:

• cassandra-jdbc-wrapper/src/main/java/com/ing/data/cassandra/jdbc/CassandraMetadataResultSet.java

  Line 738 in 35e47fe

  case VARINT:

  (here, we should use getVarint())

• cassandra-jdbc-wrapper/src/main/java/com/ing/data/cassandra/jdbc/CassandraMetadataResultSet.java

  Line 690 in 35e47fe

  case VARINT:

  (here, we should use getVarint())

[kornilova203]

@maximevw, thank you for the review! I'll push the fixes