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The heading category is planned to be backed by a single db text column.
The column will be a concatenation of all ATX style heading matches,
with a newline delimiter.
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Implemented regex operator using go flavored regular expressions.
Added optimization to combine regex's in `OR` clauses.
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Executing external commands against file metadata is a serious
security risk.
The desired features of most external commands can be safely implemented
using SQLite native functions.
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Implement optimizations that can be called in parallel or serial.
Optimizations occur mostly in place and result in a logically equivalent
tree when used correctly.
Optimizations
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* Sort - sort all statements within a clause tree
* Simplify - apply negation rules to all statements
* Flatten - merge child clauses with parents
* Compact - merge equivalent statements
* Tidy^ - remove zero statements
* Contradictions - zero contradicting statements and clauses
* StrictEquality - zero fuzzy statements when exact statements are within
clause
* Tighten - combine multiple fuzzy statements to the least (AND) or
most (OR) restrictive bounds
^: when used incorrectly can turn an invalid clause tree into a valid
one
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