[GitHub] [trafodion] selvaganesang opened a new pull request #1858: [TRAFODION-3328] Code cleanup in NADefaults

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selvaganesang opened a new pull request #1858: [TRAFODION-3328] Code cleanup in NADefaults
URL: https://github.com/apache/trafodion/pull/1858
 
 
   Avoid reading VERSIONS and DEFAULTS table after it is done once in a process.
   
   This required following cleanup
   1. cqd MODE_SEABASE is removed.
   2. Removed the support to read CQD from a file.
   3. NADefaults constructor now reads the defaults table once and
      saves off the relevant information such as currentDefaults, currentTokens,
      provenances and currentFloats to be reused by the other NADefaults objects.
   4. T2 driver doesn't use the defaultContext to compile any query. Hence, it is not
      possible to use the heap from CmpContext to save off the defaults value.
      The code has been changed the heap from CliGlobals to save the current defaults.
   5. Fixed code to use static literals as it is from the defaultsDefaults to
      avoid invalid memory in the saved defaults
   6. Changes to optimize initialization of currentTokens_ in NADefaults
   7. CQD * RESET RESET
      CQD * RESET
      Now resets to the defaults when CQD * RESET RESET was issued.
   8. Also optimized initCurrentsFromDefaultsTable further.

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