Query Execution Order

Three high level steps:

• parse
• validate
• execute

Execution Steps

1. Parsing the query

• First, the server parses the string and turns it into an AST — an abstract syntax tree. If there are any syntax errors, the server will stop execution and return the syntax error to the client.

2. Validation

• A query can be syntactically correct, but still make no sense.
• The validation stage makes sure that the query is valid given the schema before execution starts.

3. Execution