What is the origin of GraphQL’s term “fieldAST”

What is the origin of GraphQL’s term “fieldAST”

I am working through all the GraphQL stuff I can find and have been using a variable called fieldAST which sets up a projection–in formal database terms–across the properties of the object being queried or mutated.
I cannot find where the term comes from, or what AST means as an acronym. What is the deal?

Solutions/Answers:

Solution 1:

AST is “Abstract Syntax Tree”. AST is what parsers often outputs as a result, it’s a machine-readable structure that represents the actual code (GraphQL query in this case). Thus fieldASTs are parsed fields of the current selection, represented as their Abstract Syntax Trees.

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