Common (core, fundamental) module
    include/ : header files
    msg/ : error code and message    
    qcb/ : Binding 
    qcc/ : Cloning
    qcd/ : Dynamic sql
    qci/ : Interface
    qcg/ : global environment
    qcm/ : Meta management
    qcp/ : Parser
    qcu/ : Utility
    qcs/ : Security
    lib/ : library
mathematics (expression)
    qtc/ : query mathematics common
DDL module
    qdb/ : DDL taBle statement validation/optimzation/execution.
    qdc/ : other DDL statement execution
    qdd/ : DDL Drop statement validation/optimzation/execution.
    qdm/ : DDL Materialized View statement validation/optimizaion/execution.
    qdn/ : DDL coNstraint statement validation/optimzation/execution.
    qdp/ : DDL Privilege statement validation/optimzation/execution.
    qdr/ : DDL useR statement validation/optimzation/execution.
    qds/ : DDL Sequence statement validation/optimzation/execution.
    qdt/ : DDL Tablespace statement validation/optimization/execution.
    qdx/ : DDL indeX statement validation/optimzation/execution.
    qdv/ : DDL View statement validation/optimizaion/execution.
    qdsd/ : SHARD DDL statement validation/optimzation/execution.
DML module
    qmc/ : DML statement Common
    qmg/ : DML statement Graph (logical operator)
    qmn/ : DML statement execution plan Node (physical operator)
    qmo/ : DML statement Optimization
    qmv/ : DML statement Validation
    qmx/ : DML statement eXecution
Stored Procedure module
    qso/ : Stored procedure statement Optimization
    qsv/ : Stored procedure statement Validation
    qsx/ : Stored procedure statement eXecution
    qsf/ : Stored procedure extended Functions
    qss/ : Stored procedure Security ( altiwrap )
    qsc/ : Stored procedure Concurrent execute package
Replication module
    qrc/ : Replication statement validation/execution
