[WIP] KevaQL

[tuhuynh27]

Naive KQL

KQL supports:

• CREATE TABLE
• DROP TABLE
• INSERT
• UPDATE
• DELETE
• SELECT
• AND, OR
• EQUAL, NOT EQUAL
• MIN, MAX
• COUNT, AVG, SUM
• NULL VALUES
• GROUP BY
• OFFSET
• LIMIT

[tuhuynh27]

Still cannot be merged now, the visitor class is cursed