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63 lines
1.3 KiB
C++
63 lines
1.3 KiB
C++
/*++
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Copyright (c) 2006 Microsoft Corporation
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Module Name:
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dl_mk_simple_joins.h
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Abstract:
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<abstract>
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Author:
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Leonardo de Moura (leonardo) 2010-05-20.
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Revision History:
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--*/
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#ifndef DL_MK_SIMPLE_JOINS_H_
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#define DL_MK_SIMPLE_JOINS_H_
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#include"map.h"
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#include"obj_pair_hashtable.h"
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#include"dl_context.h"
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#include"dl_rule_set.h"
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#include"dl_rule_transformer.h"
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namespace datalog {
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/**
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\brief Functor for creating rules that contain simple joins.
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A simple join is the join of two tables.
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After applying this transformation, every rule has at most one join.
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So, the rules will have the form
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HEAD :- TAIL.
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HEAD :- TAIL_1, TAIL_2.
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We also assume a rule may contain interpreted expressions that work as filtering conditions.
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So, we may also have:
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HEAD :- TAIL, C_1, ..., C_n.
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HEAD :- TAIL_1, TAIL_2, C_1, ..., C_n.
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Where the C_i's are interpreted expressions.
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We say that a rule containing C_i's is a rule with a "big tail".
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*/
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class mk_simple_joins : public rule_transformer::plugin {
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context & m_context;
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rule_manager & rm;
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public:
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mk_simple_joins(context & ctx);
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rule_set * operator()(rule_set const & source);
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};
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};
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#endif /* DL_MK_SIMPLE_JOINS_H_ */
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