This patch adds an instruction to the datalog interpreter and
constructs a new AST node for min aggregation functions.
The compiler is currently still work in progress and depends on
changes made to the handling of simple joins and the preprocessor.
Signed-off-by: Alex Horn <t-alexh@microsoft.com>
Use of ptr_hash and subsequent iteration led to non-deterministic behaviour in Datalog engine.
Signed-off-by: Matthias Schlaipfer <t-matsch@microsoft.com>
