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fix issues
This commit is contained in:
Andrei Nekrashevich
parent
94c5d87ebc
commit
af469c0da5
@ -60,4 +60,43 @@ Result:
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└────────────┴────────────┴──────────────┴────────────────┴─────────────────┴──────────────────────┘
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```
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# Random functions for working with strings {#random-functions-for-working-with-strings}
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## randomString {#random-string}
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## randomFixedString {#random-fixed-string}
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## randomPrintableASCII {#random-printable-ascii}
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## randomStringUTF8 {#random-string-utf8}
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## fuzzBits {#fuzzbits}
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**Syntax**
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``` sql
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fuzzBits([s], [prob])
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```
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Inverts bits of `s`, each with probability `prob`.
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**Parameters**
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- `s` - `String` or `FixedString`
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- `prob` - constant `Float32/64`
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**Returned value**
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Fuzzed string with same as s type.
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**Example**
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``` sql
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SELECT fuzzBits(materialize('abacaba'), 0.1)
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FROM numbers(3)
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```
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``` text
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┌─fuzzBits(materialize('abacaba'), 0.1)─┐
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│ abaaaja │
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│ a*cjab+ │
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│ aeca2A │
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└───────────────────────────────────────┘
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[Original article](https://clickhouse.tech/docs/en/query_language/functions/random_functions/) <!--hide-->
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@ -18,7 +18,6 @@ namespace DB
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namespace ErrorCodes
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{
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extern const int ILLEGAL_TYPE_OF_ARGUMENT;
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extern const int TOO_LARGE_STRING_SIZE;
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extern const int ILLEGAL_COLUMN;
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extern const int DECIMAL_OVERFLOW;
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}
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@ -65,13 +64,15 @@ public:
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size_t getNumberOfArguments() const override { return 2; }
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ColumnNumbers getArgumentsThatAreAlwaysConstant() const override { return {1}; } // indexing from 0
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DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override
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{
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if (!isStringOrFixedString(arguments[0].type))
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throw Exception(
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"First argument of function " + getName() + " must be String or FixedString", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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if (!arguments[1].column || !isFloat(arguments[1].type) || !isColumnConst(*arguments[1].column))
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if (!arguments[1].column || !isFloat(arguments[1].type))
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throw Exception("Second argument of function " + getName() + " must be constant float", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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return arguments[0].type;
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@ -82,9 +83,13 @@ public:
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void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t input_rows_count) override
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{
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const auto col_in_untyped = block.getByPosition(arguments[0]).column;
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auto col_in_untyped = block.getByPosition(arguments[0]).column;
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const double inverse_probability = assert_cast<const ColumnConst &>(*block.getByPosition(arguments[1]).column).getValue<double>();
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if (const ColumnConst * col_in_untyped_const = checkAndGetColumnConstStringOrFixedString(col_in_untyped.get()))
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{
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col_in_untyped = col_in_untyped_const->getDataColumnPtr();
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}
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if (const ColumnString * col_in = checkAndGetColumn<ColumnString>(col_in_untyped.get()))
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{
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@ -108,9 +113,9 @@ public:
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block.getByPosition(result).column = std::move(col_to);
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}
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else if (const ColumnFixedString * col_fixed_in = checkAndGetColumn<ColumnFixedString>(col_in_untyped.get()))
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else if (const ColumnFixedString * col_in_fixed = checkAndGetColumn<ColumnFixedString>(col_in_untyped.get()))
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{
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const auto n = col_fixed_in->getN();
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const auto n = col_in_fixed->getN();
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auto col_to = ColumnFixedString::create(n);
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ColumnFixedString::Chars & chars_to = col_to->getChars();
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@ -120,9 +125,11 @@ public:
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chars_to.resize(total_size);
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const auto * ptr_in = col_fixed_in->getChars().data();
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const auto * ptr_in = col_in_fixed->getChars().data();
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auto * ptr_to = chars_to.data();
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fuzzBits(ptr_in, ptr_to, chars_to.size(), inverse_probability);
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block.getByPosition(result).column = std::move(col_to);
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}
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else
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{
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@ -3,20 +3,12 @@
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<query>SELECT count() FROM zeros(1000000) WHERE NOT ignore(fuzzBits(randomString(10), 0.1))</query>
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<query>SELECT count() FROM zeros(100000) WHERE NOT ignore(fuzzBits(randomString(100), 0.1))</query>
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<query>SELECT count() FROM zeros(10000) WHERE NOT ignore(fuzzBits(randomString(1000), 0.1))</query>
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<query>SELECT count() FROM zeros(1000) WHERE NOT ignore(fuzzBits(randomString(10000), 0.1))</query>
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<query>SELECT count() FROM zeros(1000000) WHERE NOT ignore(fuzzBits(randomString(rand() % 10), 0.1))</query>
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<query>SELECT count() FROM zeros(100000) WHERE NOT ignore(fuzzBits(randomString(rand() % 100), 0.1))</query>
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<query>SELECT count() FROM zeros(10000) WHERE NOT ignore(fuzzBits(randomString(rand() % 1000), 0.1))</query>
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<query>SELECT count() FROM zeros(100000) WHERE NOT ignore(fuzzBits(randomString(100), 0.5))</query>
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<query>SELECT count() FROM zeros(10000) WHERE NOT ignore(fuzzBits(randomFixedString(1000), 0.1))</query>
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<query>SELECT count() FROM zeros(1000) WHERE NOT ignore(fuzzBits(randomFixedString(10000), 0.5))</query>
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<query>SELECT count() FROM zeros(1000000) WHERE NOT ignore(fuzzBits(randomString(rand() % 10), 0.7))</query>
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<query>SELECT count() FROM zeros(100000) WHERE NOT ignore(fuzzBits(randomString(rand() % 100), 0.7))</query>
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<query>SELECT count() FROM zeros(10000) WHERE NOT ignore(fuzzBits(randomString(rand() % 1000), 0.7))</query>
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<query>SELECT count() FROM zeros(1000000) WHERE NOT ignore(fuzzBits(randomFixedString(10), 0.5))</query>
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<query>SELECT count() FROM zeros(100000) WHERE NOT ignore(fuzzBits(randomFixedString(100), 0.5))</query>
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<query>SELECT count() FROM zeros(10000) WHERE NOT ignore(fuzzBits(randomFixedString(1000), 0.5))</query>
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<query>SELECT count() FROM zeros(1000) WHERE NOT ignore(fuzzBits(randomFixedString(10000), 0.5))</query>
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</test>
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@ -1,2 +1,5 @@
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100
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String
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FixedString(10)
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1
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@ -1,4 +1,36 @@
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SELECT fuzzBits(toString('string'), 1); -- { serverError 43 }
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SELECT fuzzBits('', 0.3); -- { serverError 44 }
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SELECT length(fuzzBits(randomString(100), 0.5));
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SELECT toTypeName(fuzzBits(randomString(100), 0.5));
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SELECT
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fuzzBits(toString('string'), 1);
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-- { serverError 43 }
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SELECT
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fuzzBits('', 0.3);
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SELECT
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length(fuzzBits(randomString(100), 0.5));
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SELECT
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toTypeName(fuzzBits(randomString(100), 0.5));
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SELECT
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toTypeName(fuzzBits(toFixedString('abacaba', 10), 0.9));
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SELECT
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(
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(0.3 * 0.99) * 8 * 10000 < sum
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AND sum < (0.3 * 1.01) * 8 * 10000
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) AS res
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FROM
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(
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SELECT
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arraySum(
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id -> bitCount(
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reinterpretAsUInt8(
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substring(
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fuzzBits(
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arrayStringConcat(arrayMap(x -> toString('\0'), range(10000))),
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0.3
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),
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id + 1,
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1
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)
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)
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),
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range(10000)
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) as sum
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)
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