pl/mysql partition digraph tests - #38115
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Contractions (Czech ch), expansions (ß, on the stock default collation), and ignorables (NUL) make LEFT() truncation non-monotonic with key order, handing the walk an inverted range that fails with MissingRowEstimate. One live test pins each family. A fourth test pins that trailing-space truncations under the PAD SPACE collations integration splits (bin, general_ci) stay ordered and partition cleanly.
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