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We should use exprTypmod() to extract the typmod of the expression, instead of just blindly storing -1. This seems to have been an aboriginal oversight in commit fc8d970cbcdd6f025475822a4cf01dfda0873226 which introduced general-expression indexes. The consequences are only cosmetic at present, since the index machinery doesn't really look at typmod for index columns; but still it seems best to describe the column type as precisely as we can. Per off-list complaint from Thomas Fanghaenel.
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