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Add basic compiler support for min aggregation function

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Signed-off-by: Alex Horn <t-alexh@microsoft.com>
This commit is contained in:
Alex Horn 2015-06-11 16:23:26 +01:00
parent c8a123b7dd
commit 8c097044e8
2 changed files with 66 additions and 0 deletions
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18
src/muz/rel/dl_compiler.h
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@ -120,6 +120,22 @@ namespace datalog {
instruction_observer m_instruction_observer;
expr_free_vars m_free_vars;
/**
\brief Finds all the min aggregation functions in the premise of a given rule.
*/
static void find_min_aggregates(const rule * r, ptr_vector<func_decl>& min_aggregates);
/**
\brief Decides whether a predicate is subject to a min aggregation function.
If \c decl is subject to a min aggregation function, the output parameters are written
with the neccessary information.
\returns true if the output paramaters have been written
*/
static bool prepare_min_aggregate(const func_decl * decl, const ptr_vector<func_decl>& min_aggregates,
unsigned_vector & group_by_cols, unsigned & min_col);
/**
If true, the union operation on the underlying structure only provides the information
whether the updated relation has changed or not. In this case we do not get anything
@ -146,6 +162,8 @@ namespace datalog {
void make_join(reg_idx t1, reg_idx t2, const variable_intersection & vars, reg_idx & result,
bool reuse_t1, instruction_block & acc);
void make_min(reg_idx source, reg_idx & target, const unsigned_vector & group_by_cols,
const unsigned min_col, instruction_block & acc);
void make_join_project(reg_idx t1, reg_idx t2, const variable_intersection & vars,
const unsigned_vector & removed_cols, reg_idx & result, bool reuse_t1, instruction_block & acc);
void make_filter_interpreted_and_project(reg_idx src, app_ref & cond,