ClickHouse/docs/en/sql-reference/table-functions/fuzzQuery.md

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/en/sql-reference/table-functions/fuzzQuery	75	fuzzQuery

fuzzQuery

Perturbs the given query string with random variations.

fuzzQuery(query[, max_query_length[, random_seed]])

Arguments

• query (String) - The source query to perform the fuzzing on.
• max_query_length (UInt64) - A maximum length the query can get during the fuzzing process.
• random_seed (UInt64) - A random seed for producing stable results.

Returned Value

A table object with a single column containing perturbed query strings.

Usage Example

SELECT * FROM fuzzQuery('SELECT materialize(\'a\' AS key) GROUP BY key') LIMIT 2;

   ┌─query──────────────────────────────────────────────────────────┐
1. │ SELECT 'a' AS key GROUP BY key                                 │
2. │ EXPLAIN PIPELINE compact = true SELECT 'a' AS key GROUP BY key │
   └────────────────────────────────────────────────────────────────┘