TokyoTyrant::RDBQC_STREQ is case sensitive. The key in TokyoCabinet is case sensitive too.
For instance:
<?php
$tt->put("test",array("column1"=>"data1"));
$tt->put("Test",array("Column1"=>"data1"));
?>
added 2 rows in tc.
<?php
$query=$tt->getQuery();
$query->addCond("Column1", TokyoTyrant::RDBQC_STREQ, "data1");
$query->search();
?>
there will be only one result, and it's the row with key="Test".