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ProvSQL C/C++ API
Adding support for provenance and uncertainty management to PostgreSQL databases
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ProvSQL C/C++ API
Adding support for provenance and uncertainty management to PostgreSQL databases
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Descriptor for an inner sub-Query introduced when one or more shared classes have partial coverage. More...
Public Attributes | |
| int | group_id |
| List * | member_atoms |
| List of safe_rewrite_atom *, in original-rtindex order. | |
| List * | inner_quals |
| List of Node *: cross-atom conjuncts whose vars all reference group members (original varnos; the rewriter remaps to inner varnos at build time). | |
| Index | outer_rtindex |
| Assigned by the rewriter: position of the inner sub-Query RTE in the outer rtable. | |
Descriptor for an inner sub-Query introduced when one or more shared classes have partial coverage.
Every member atom shares the same partial-coverage set; the group is folded into a single RTE_SUBQUERY at the outer level whose targetList is the fully-covered-class bindings (root first, then other fully-covered classes in ascending repr order) plus the implicit provsql column, and whose groupClause aggregates the partial-coverage variables away. The hierarchical-CQ rewriter fires again when process_query re-enters on the inner sub-Query, so the per-atom SELECT DISTINCT wraps materialise inside.
Definition at line 315 of file safe_query.c.
| int safe_inner_group::group_id |
Definition at line 316 of file safe_query.c.
| List* safe_inner_group::inner_quals |
List of Node *: cross-atom conjuncts whose vars all reference group members (original varnos; the rewriter remaps to inner varnos at build time).
Definition at line 318 of file safe_query.c.
| List* safe_inner_group::member_atoms |
List of safe_rewrite_atom *, in original-rtindex order.
Definition at line 317 of file safe_query.c.
| Index safe_inner_group::outer_rtindex |
Assigned by the rewriter: position of the inner sub-Query RTE in the outer rtable.
Definition at line 319 of file safe_query.c.