defuse

undo the effects of complete fusion

Synopsis

defuse(val any) -> any

Description

The defuse function converts a value val containing any fusion types into its original type by downcasting all instances of fusion values to their subtype equivalent.

Examples

Remove union types

# spq
defuse(this)
# input
fusion({a:1::(int64|string)},<{a:int64}>)
fusion({a:"foo"::(int64|string)},<{a:string}>)
# expected output
{a:1}
{a:"foo"}

Retain optional fields using complete fusion

# spq
fuse | defuse(this)
# input
{x:1}
{x:2,y:3}
{x:4,z?:_::int64}
# expected output
{x:1}
{x:2,y:3}
{x:4,z?:_::int64}