def and deps

#def and #deps are used to define dependencies for complex query like A will automatically enables B, when meets certain conditions.

For example:

#def<A, "A text here">
#if(Condition)
{
    #deps<A>
    Condition text here
}

If Condition satisfied, deps<A> will auto enable #def<A>, and the final result is:

A text here
Condition text here

Otherwise, the final result is(nothing):

Remark

• Include in sub-sql(sql{...}) cannot be processed:

sql v1
{
    #isEqual<A, true, sql { #include<v2> }
}

sql v2
{
    #def<K, 'Test'>
    #deps<K>
}

When A==true, should include v2, but K Won't be enabled by #deps.

• #def/#deps can be processed in direct #include<>:

sql v1 {#include<v2>}
sql v2 {#def<K, 'Test'>#deps<K>}

Will emit: test