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bootstrap

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    Add exclusion constraints, which generalize the concept of uniqueness to
    Tom Lane authored 
    support any indexable commutative operator, not just equality.  Two rows
violate the exclusion constraint if "row1.col OP row2.col" is TRUE for
each of the columns in the constraint.

Jeff Davis, reviewed by Robert Haas
    0cb65564
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    user avatar 0cb65564
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