Although it is not apparent in our logs, we are delivering response messages out of order.

From our logs we have:

2019-02-14 08:18:12.476 org.teiid.ODBC TRACE NIO1 invoking server method: prepare [, select 3 from pg_class where relname='pg_class', []]
2019-02-14 08:18:12.476 org.teiid.ODBC TRACE NIO1 invoking client method: org.teiid.transport.ODBCClientInstance@6064753f prepareCompleted []
2019-02-14 08:18:12.48 org.teiid.ODBC TRACE NIO1 invoking server method: bindParameters [, , [], 0, null, UTF-8]
2019-02-14 08:18:12.481 org.teiid.ODBC TRACE NIO1 invoking client method: org.teiid.transport.ODBCClientInstance@6064753f bindComplete null
2019-02-14 08:18:12.481 org.teiid.ODBC TRACE NIO1 invoking server method: getResultSetMetaDataDescription []
2019-02-14 08:18:12.481 org.teiid.ODBC TRACE NIO1 invoking client method: org.teiid.transport.ODBCClientInstance@6064753f sendResultSetDescription [[org.teiid.odbc.PGUtil$PgColInfo@333d1d1b], null]
2019-02-14 08:18:12.481 org.teiid.ODBC TRACE NIO1 invoking server method: execute [, 0]
2019-02-14 08:18:12.484 org.teiid.ODBC TRACE NIO1 invoking client method: org.teiid.transport.ODBCClientInstance@6064753f sendResults [null, org.teiid.jdbc.ResultSetImpl@4516a1a2, [org.teiid.odbc.PGUtil$PgColInfo@333d1d1b], org.teiid.client.util.ResultsFuture@1e98b9de, FORWARD, -1, false, null]
2019-02-14 08:18:12.486 org.teiid.ODBC TRACE Worker2_QueryProcessorQueue211 invoking client method: org.teiid.transport.ODBCClientInstance@6064753f sendCommandComplete [select 3 from pg_class where relname='pg_class', [1]]
2019-02-14 08:18:12.486 org.teiid.ODBC TRACE NIO1 invoking server method: sync null
2019-02-14 08:18:12.486 org.teiid.ODBC TRACE NIO1 invoking client method: org.teiid.transport.ODBCClientInstance@6064753f ready [false, false]
2019-02-14 08:18:12.486 org.teiid.ODBC TRACE Worker0_QueryProcessorQueue212 invoking client method: org.teiid.transport.ODBCClientInstance@3e802be1 ready [false, false]

At the network level we see ready delivered before the data row.