[jira] [Created] (TAJO-236) Implement LogicalPlanVerifier to check if a logical plan is valid

["Hyunsik Choi (JIRA)" <ji...@apache.org>]

Hyunsik Choi created TAJO-236:
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             Summary: Implement LogicalPlanVerifier to check if a logical plan is valid
                 Key: TAJO-236
                 URL: https://issues.apache.org/jira/browse/TAJO-236
             Project: Tajo
          Issue Type: Improvement
            Reporter: Hyunsik Choi
             Fix For: 0.2-incubating


The current Tajo does not have any verification system to check whether a logical plan is valid, or not. LogicalPlanVerifier will verify the followings of a logical plan:
 * operand types checking
 ** some operators have type restrictions. For example, plus(\+)'s operands must be numerical values.
 * Table and column existence check. 
 ** Examples are as follows:
 *** a create table statement must check if the table already exists
 *** columns included in select list must exist in corresponding tables.



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