[TAJO-236] Implement LogicalPlanVerifier to check if a logical plan is valid

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.2-incubating
• Component/s: Planner/Optimizer
• Assignee: Hyunsik Choi
• Reporter: Hyunsik Choi
• Created: 07/Oct/13 07:38
• Updated: 17/Oct/13 03:04
• Resolved: 17/Oct/13 02:13

Description

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.

Issue Links

• is related to: TAJO-209 'create table as' statement causes IllegalStateException