**Use case**
A friend wants to show me a set of queries, but is afraid to reveal the names of columns (domain area) and the values of constants.

**Describe the solution you'd like**
A simple ad-hoc solution that will be mostly acceptable.

Use Lexer to tokenize query and replace tokens. Use a list of english nouns or similar words for replacements. The user will specify a salt in command line to make deterministic pseudorandom unpredictable replacement.

Split identifiers to words according to their style (snake_case, CamelCase, ALL_CAPS). If identifier is too complex, treat it as a single word. These words will be replaced with english nouns selected by the value of a SipHash from the word and the salt. Save all replacements in a map to track collisions. In case of collision, add 1 to the salt and repeat to select another noun. Keep the style of replaced identifiers for convenience. Keep some words like `id`, `num`, `value` unreplaced.

For literals in a query: for numbers, dates, datetimes, apply a model similar to clickhouse-obfuscator. For string literals, keep punctuation charaters as is to keep the meaning of LIKE and regexp. Replace alphanumeric parts to a gibberish of similar length (maybe keeping alpha and numerics). Replace valid UTF-8 to another valid UTF-8 while keeping the number of leading zeros in bytes.

Keep the keywords in the query as is. (Lexer does not know about keywords, so we have to list them explicitly).
{
    
    words = {"CREATE",       "DATABASE", "IF",     "NOT",       "EXISTS",   "TEMPORARY",   "TABLE",    "ON",          "CLUSTER", "DEFAULT",
             "MATERIALIZED", "ALIAS",    "ENGINE", "AS",        "VIEW",     "POPULATE",    "SETTINGS", "ATTACH",      "DETACH",  "DROP",
             "RENAME",       "TO",       "ALTER",  "ADD",       "MODIFY",   "CLEAR",       "COLUMN",   "AFTER",       "COPY",    "PROJECT",
             "PRIMARY",      "KEY",      "CHECK",  "PARTITION", "PART",     "FREEZE",      "FETCH",    "FROM",        "SHOW",    "INTO",
             "OUTFILE",      "FORMAT",   "TABLES", "DATABASES", "LIKE",     "PROCESSLIST", "CASE",     "WHEN",        "THEN",    "ELSE",
             "END",          "DESCRIBE", "DESC",   "USE",       "SET",      "OPTIMIZE",    "FINAL",    "DEDUPLICATE", "INSERT",  "VALUES",
             "SELECT",       "DISTINCT", "SAMPLE", "ARRAY",     "JOIN",     "GLOBAL",      "LOCAL",    "ANY",         "ALL",     "INNER",
             "LEFT",         "RIGHT",    "FULL",   "OUTER",     "CROSS",    "USING",       "PREWHERE", "WHERE",       "GROUP",   "BY",
             "WITH",         "TOTALS",   "HAVING", "ORDER",     "COLLATE",  "LIMIT",       "UNION",    "AND",         "OR",      "ASC",
             "IN",           "KILL",     "QUERY",  "SYNC",      "ASYNC",    "TEST",        "BETWEEN",  "TRUNCATE",    "USER",    "ROLE",
             "PROFILE",      "QUOTA",    "POLICY", "ROW",       "GRANT",    "REVOKE",      "OPTION",   "ADMIN",       "EXCEPT",  "REPLACE",
             "IDENTIFIED",   "HOST",     "NAME",   "READONLY",  "WRITABLE", "PERMISSIVE",  "FOR",      "RESTRICTIVE", "FOR",     "RANDOMIZED",
             "INTERVAL",     "LIMITS",   "ONLY",   "TRACKING",  "IP",       "REGEXP",      "ILIKE"};
}
void Suggest::loadImpl(Connection & connection, const ConnectionTimeouts & timeouts, size_t suggestion_limit)