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Since 3db72eb, the calculation of the query ID hash for utilities is not done based on the textual query strings, but on their internal Query representation, meaning that there can be an overlap when they use literal constants. The documentation of pg_stat_statements was missing a refresh about that. Extracted from a larger patch by me. Discussion: https://postgr.es/m/Y+MRdEq9W9XVa2AB@paquier.xyz