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Add datalog infrastructure for min aggregation function

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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>
This commit is contained in:
Alex Horn 2015-06-10 18:09:56 +01:00
parent 004bf1471f
commit 140fb7942d
11 changed files with 418 additions and 3 deletions
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src/muz/rel/dl_instruction.h
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@ -93,6 +93,7 @@ namespace datalog {
unsigned m_filter_interp_project;
unsigned m_filter_id;
unsigned m_filter_eq;
unsigned m_min;
stats() { reset(); }
void reset() { memset(this, 0, sizeof(*this)); }
};
@ -284,6 +285,8 @@ namespace datalog {
static instruction * mk_join_project(reg_idx rel1, reg_idx rel2, unsigned joined_col_cnt,
const unsigned * cols1, const unsigned * cols2, unsigned removed_col_cnt,
const unsigned * removed_cols, reg_idx result);
static instruction * mk_min(reg_idx source, reg_idx target, const unsigned_vector & group_by_cols,
const unsigned min_col);
static instruction * mk_rename(reg_idx src, unsigned cycle_len, const unsigned * permutation_cycle,
reg_idx tgt);
static instruction * mk_filter_by_negation(reg_idx tgt, reg_idx neg_rel, unsigned col_cnt,