presto-main/src/main/java/io/prestosql/sql/analyzer/Analysis.java/Analysis/Analysis
class Analysis:    public Analysis(@Nullable Statement root, Map<NodeRef<Parameter>, Expression> parameters, boolean isDescribe)
    {
        this.root = root;
        this.parameters = ImmutableMap.copyOf(requireNonNull(parameters, "parameterMap is null"));
        this.isDescribe = isDescribe;
    }