DMN14 — New built-in function to merge/concatenate two or more contexts

Currently, it is not possible to merge/concatenate two or more contexts. A context can only be declared statically.

We need to model a decision that gets two or more contexts and returns a new context that includes all entries of the given contexts.

Suggestions:

• introduce a new built-in function similar to the concatenate() function of lists but for contexts
• it is named `put all` (like Java's Map#putAll function)
• it has one argument: contexts... (type: list<context<Any>>)
• it returns a new context that includes all entries from the given contexts
• it might override context entries if the keys are equal. The entries are overridden in the same order as the contexts are passed in the function

put all({x:1}, {y:2})
// returns: {x:1, y:2}

Close as merged

Resolved as part of DMN14-187