The MySQL DDL parser was not properly consuming function declarations. For functions, the parser consumes the entire statement without handline the various expressions within the function declaration, but the parser was not properly finding the end of the statement and instead was continuing to try to consume values beyond the end of the statement.
Specifically, when the parser consumes a `BEGIN`, it looks for a corresponding `END`. However, if it encountered an `END IF`, the `IF` plus any remaining tokens were left on the token stream and unprocessed. This confused the parser, which keep looking for statements and ultimately ended with a `No more content` error.
This case was replicated in integration tests, and the code fixed to properly find the end of the statements.
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