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authorTom Lane <tgl@sss.pgh.pa.us>2010-01-07 19:53:27 +0000
committerTom Lane <tgl@sss.pgh.pa.us>2010-01-07 19:53:27 +0000
commit26098d8f8650d3ee667b75de54c6977b7ef021b3 (patch)
tree3eb75fe5051aada8603fadf5dd8451cf21775b33 /src/backend/regex
parent2de646cd8f31318b1642c0f2cb717b32207d53e0 (diff)
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Make bit/varbit substring() treat any negative length as meaning "all the rest
of the string". The previous coding treated only -1 that way, and would produce an invalid result value for other negative values. We ought to fix it so that 2-parameter bit substring() is a different C function and the 3-parameter form throws error for negative length, but that takes a pg_proc change which is impractical in the back branches; and in any case somebody might be relying on -1 working this way. So just do this as a back-patchable fix.
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