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The default JSONB GIN opclass (jsonb_ops) converts numeric data values to strings for storage in the index. It must ensure that numeric values that would compare equal (such as 12 and 12.00) produce identical strings, else index searches would have behavior different from regular JSONB comparisons. Unfortunately the function charged with doing this was completely wrong: it could reduce distinct numeric values to the same string, or reduce equivalent numeric values to different strings. The former type of error would only lead to search inefficiency, but the latter type of error would cause index entries that should be found by a search to not be found. Repairing this bug therefore means that it will be necessary for 9.4 beta testers to reindex GIN jsonb_ops indexes, if they care about getting correct results from index searches involving numeric data values within the comparison JSONB object. Per report from Thomas Fanghaenel. |
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