Module query_function 

Recognition of the Origin query functions from the parsed statement.

VERIFY_AUDIT_CHAIN, VERIFY_HASH_CHAIN, BALANCE_AS_OF, TEMPORAL_LOOKUP, VERIFY_BALANCE and CONVERT_CURRENCY_LOOKUP each run as a whole statement: SELECT <FUNC>(<literal>, ...). A lexer gate keeps the extra parse off ordinary statements. It passes only a SELECT whose plain text (outside literals, quoted identifiers and comments) names one of the functions. The parsed AST then decides.

Structs

BalanceAsOfArgs

BALANCE_AS_OF(collection, key, column, timestamp).

ConvertCurrencyLookupArgs

CONVERT_CURRENCY_LOOKUP(amount, from, to, rate_table, as_of, key_column, rate_column, time_column, precision).

TemporalLookupArgs

TEMPORAL_LOOKUP(table, key_value, as_of, key_column, time_column).

VerifyAuditChainArgs

VERIFY_AUDIT_CHAIN([from_seq [, to_seq]]).

VerifyBalanceArgs

VERIFY_BALANCE(collection, column).

VerifyHashChainArgs

VERIFY_HASH_CHAIN(collection).

Enums

QueryFunction

One query function.

QueryFunctionCall

One recognized call. Each argument holds the literal’s text: a string’s content (quotes removed, escapes resolved) or a number as written.

Functions

parse_query_function

Recognize a query-function statement.