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[3.0] Puts an index prefix length outside the column's quoting #9652

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[3.0] Puts an index prefix length outside the column's quoting #9652

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15 changes: 14 additions & 1 deletion Sources/Db/APIs/MySQL.php
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Original file line number Diff line number Diff line change
Expand Up @@ -1233,7 +1233,20 @@ public function table_sql(string $table_name): string
break;
}

$line .= ' (`' . implode('`, `', $index['columns']) . '`)';
$index_columns = [];

foreach ($index['columns'] as $index_column) {
// A column can be indexed by its first so many characters.
// The count belongs after the name rather than inside it,
// so it has to be left outside the quoting.
if (preg_match('~^(.+)\((\d+)\)$~', $index_column, $matches) === 1) {
$index_columns[] = '`' . $matches[1] . '`(' . $matches[2] . ')';
} else {
$index_columns[] = '`' . $index_column . '`';
}
}

$line .= ' (' . implode(', ', $index_columns) . ')';

$inner_lines[] = $line;
}
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