Parsing is, amongst others, used for parsing default values. These will often be the same for the same types in a lot of tables (e.g. converting a string to a date for datetime columns, or constants for string or numbers). Creating a parse tree takes time, and with a cache, we can skip a lot of parse tree creations.
Parsing is, amongst others, used for parsing default values. These will often be the same for the same types in a lot of tables (e.g. converting a string to a date for datetime columns, or constants for string or numbers). Creating a parse tree takes time, and with a cache, we can skip a lot of parse tree creations.