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Add "Call" command to execute functions
Refactor object selector set logic
Initial implementation of IF command
Allow to specify simple expressions in FROM block
Fix CTE parse with subselect
Add more code comments
Capture current variables scope for Select
Get property value safer
Replace CommandHandler by IFuncUnit
Convert some for loops to foreach
Decouple Commands module from Execution module
Refactor func units functionality
Skip node type resolution if it is already resolved
Move some messages to resources