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package sqlancer;
import java.io.IOException;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.function.UnaryOperator;
import java.util.stream.Collectors;
import sqlancer.common.query.ExpectedErrors;
import sqlancer.common.query.SQLQueryAdapter;
import sqlancer.common.query.SQLancerResultSet;
public final class ComparatorHelper {
public enum ComparisonMode {
SET,
MULTISET,
ULP_TOLERANT_MULTISET
}
private ComparatorHelper() {
}
private static String trimTrailingDotZeros(String s) {
int len = s.length();
if (len < 2 || s.charAt(len - 1) != '0') {
return s;
}
int i = len - 1;
while (i > 0 && s.charAt(i) == '0') {
i--;
}
if (s.charAt(i) != '.') {
return s;
}
return s.substring(0, i);
}
public static boolean isEqualDouble(String first, String second) {
try {
double val = Double.parseDouble(first);
double secVal = Double.parseDouble(second);
return equals(val, secVal);
} catch (Exception e) {
return false;
}
}
static boolean equals(double a, double b) {
if (a == b) {
return true;
}
return Math.abs(a - b) < 0.001 * Math.max(Math.abs(a), Math.abs(b)) + 0.001;
}
public static List<String> getResultSetFirstColumnAsString(String queryString, ExpectedErrors errors,
SQLGlobalState<?, ?> state) throws SQLException {
if (state.getOptions().logEachSelect()) {
state.getLogger().writeCurrent(queryString);
try {
state.getLogger().getCurrentFileWriter().flush();
} catch (IOException e) {
e.printStackTrace();
}
}
boolean canonicalizeString = state.getOptions().canonicalizeSqlString();
SQLQueryAdapter q = new SQLQueryAdapter(queryString, errors, true, canonicalizeString);
List<String> resultSet = new ArrayList<>();
SQLancerResultSet result = null;
try {
result = q.executeAndGet(state);
if (result == null) {
throw new IgnoreMeException();
}
while (result.next()) {
String resultTemp = result.getString(1);
if (resultTemp != null) {
resultTemp = trimTrailingDotZeros(resultTemp);
}
resultSet.add(resultTemp);
}
} catch (Exception e) {
if (e instanceof IgnoreMeException) {
throw e;
}
Throwable current = e;
while (current != null) {
if (current.getMessage() != null && errors.errorIsExpected(current.getMessage())) {
throw new IgnoreMeException();
}
current = current.getCause();
}
throw new AssertionError(queryString, e);
} finally {
if (result != null && !result.isClosed()) {
result.close();
}
}
return resultSet;
}
public static void assumeResultSetsAreEqual(List<String> resultSet, List<String> secondResultSet,
String originalQueryString, List<String> combinedString, SQLGlobalState<?, ?> state) {
assumeResultSetsAreEqual(resultSet, secondResultSet, originalQueryString, combinedString, state,
ComparisonMode.SET);
}
public static void assumeResultSetsAreEqual(List<String> resultSet, List<String> secondResultSet,
String originalQueryString, List<String> combinedString, SQLGlobalState<?, ?> state, ComparisonMode mode) {
if (resultSet.size() != secondResultSet.size()) {
String queryFormatString = "-- %s;" + System.lineSeparator() + "-- cardinality: %d"
+ System.lineSeparator();
String firstQueryString = String.format(queryFormatString, originalQueryString, resultSet.size());
String combinedQueryString = String.join(";", combinedString);
String secondQueryString = String.format(queryFormatString, combinedQueryString, secondResultSet.size());
state.getState().getLocalState()
.log(String.format("%s" + System.lineSeparator() + "%s", firstQueryString, secondQueryString));
String assertionMessage = String.format(
"The size of the result sets mismatch (%d and %d)!" + System.lineSeparator()
+ "First query: \"%s\", whose cardinality is: %d" + System.lineSeparator()
+ "Second query:\"%s\", whose cardinality is: %d",
resultSet.size(), secondResultSet.size(), originalQueryString, resultSet.size(),
combinedQueryString, secondResultSet.size());
throw new AssertionError(assertionMessage);
}
if (state.getOptions().validateResultSizeOnly()) {
return;
}
boolean contentMatches;
switch (mode) {
case MULTISET:
contentMatches = multisetsEqual(resultSet, secondResultSet)
|| multisetsEqual(canonicalizeFloatsList(resultSet), canonicalizeFloatsList(secondResultSet))
|| floatTolerantMultisetsEqual(resultSet, secondResultSet);
break;
case ULP_TOLERANT_MULTISET:
contentMatches = multisetsEqual(canonicalizeFloatsList(resultSet), canonicalizeFloatsList(secondResultSet))
|| floatTolerantMultisetsEqual(resultSet, secondResultSet);
break;
case SET:
default:
Set<String> firstHashSet = new HashSet<>(resultSet);
Set<String> secondHashSet = new HashSet<>(secondResultSet);
contentMatches = firstHashSet.equals(secondHashSet)
|| canonicalizeFloats(resultSet).equals(canonicalizeFloats(secondResultSet))
|| floatTolerantMultisetsEqual(new ArrayList<>(firstHashSet), new ArrayList<>(secondHashSet));
break;
}
if (!contentMatches) {
Set<String> firstResultSetMisses = new HashSet<>(resultSet);
firstResultSetMisses.removeAll(secondResultSet);
Set<String> secondResultSetMisses = new HashSet<>(secondResultSet);
secondResultSetMisses.removeAll(resultSet);
String queryFormatString = "-- Query: \"%s\"; It misses: \"%s\"";
String firstQueryString = String.format(queryFormatString, originalQueryString, firstResultSetMisses);
String secondQueryString = String.format(queryFormatString, String.join(";", combinedString),
secondResultSetMisses);
state.getState().getLocalState()
.log(String.format("%s" + System.lineSeparator() + "%s", firstQueryString, secondQueryString));
String assertionMessage = String.format("The content of the result sets mismatch!" + System.lineSeparator()
+ "First query : \"%s\"" + System.lineSeparator() + "Second query: \"%s\"", originalQueryString,
secondQueryString);
throw new AssertionError(assertionMessage);
}
}
private static final double FLOAT_REL_TOLERANCE = 1e-9;
private static final double FLOAT_ABS_TOLERANCE = 1e-9;
private static boolean floatsWithinTolerance(double a, double b) {
if (a == b) {
return true;
}
double diff = Math.abs(a - b);
return diff <= FLOAT_REL_TOLERANCE * Math.max(Math.abs(a), Math.abs(b)) + FLOAT_ABS_TOLERANCE;
}
static boolean floatTolerantMultisetsEqual(List<String> a, List<String> b) {
if (a.size() != b.size()) {
return false;
}
List<Double> numA = new ArrayList<>();
List<Double> numB = new ArrayList<>();
List<String> otherA = new ArrayList<>();
List<String> otherB = new ArrayList<>();
partitionFiniteDoubles(a, numA, otherA);
partitionFiniteDoubles(b, numB, otherB);
if (numA.size() != numB.size() || !multisetsEqual(otherA, otherB)) {
return false;
}
Collections.sort(numA);
Collections.sort(numB);
for (int i = 0; i < numA.size(); i++) {
if (!floatsWithinTolerance(numA.get(i), numB.get(i))) {
return false;
}
}
return true;
}
private static void partitionFiniteDoubles(List<String> values, List<Double> numeric, List<String> other) {
for (String v : values) {
Double d = parseFiniteDouble(v);
if (d == null) {
other.add(v);
} else {
numeric.add(d);
}
}
}
private static Double parseFiniteDouble(String v) {
if (v == null) {
return null;
}
boolean hasDigit = false;
for (int i = 0; i < v.length(); i++) {
char c = v.charAt(i);
if (c >= '0' && c <= '9') {
hasDigit = true;
break;
}
}
if (!hasDigit) {
return null;
}
try {
double d = Double.parseDouble(v);
if (Double.isNaN(d) || Double.isInfinite(d)) {
return null;
}
return d;
} catch (NumberFormatException e) {
return null;
}
}
private static boolean multisetsEqual(List<String> a, List<String> b) {
if (a.size() != b.size()) {
return false;
}
Map<String, Integer> counts = new HashMap<>(a.size() * 2);
for (String v : a) {
counts.merge(v, 1, Integer::sum);
}
for (String v : b) {
Integer c = counts.get(v);
if (c == null) {
return false;
}
if (c == 1) {
counts.remove(v);
} else {
counts.put(v, c - 1);
}
}
return counts.isEmpty();
}
private static List<String> canonicalizeFloatsList(List<String> values) {
List<String> out = new ArrayList<>(values.size());
for (String v : values) {
out.add(normalizeFloatString(v));
}
return out;
}
public static void assumeResultSetsAreEqual(List<String> resultSet, List<String> secondResultSet,
String originalQueryString, List<String> combinedString, SQLGlobalState<?, ?> state,
UnaryOperator<String> canonicalizationRule) {
List<String> canonicalizedResultSet = resultSet.stream().map(canonicalizationRule).collect(Collectors.toList());
List<String> canonicalizedSecondResultSet = secondResultSet.stream().map(canonicalizationRule)
.collect(Collectors.toList());
assumeResultSetsAreEqual(canonicalizedResultSet, canonicalizedSecondResultSet, originalQueryString,
combinedString, state);
}
public static List<String> getCombinedResultSet(String firstQueryString, String secondQueryString,
String thirdQueryString, List<String> combinedString, boolean asUnion, SQLGlobalState<?, ?> state,
ExpectedErrors errors) throws SQLException {
List<String> secondResultSet;
if (asUnion) {
String unionString = firstQueryString + " UNION ALL " + secondQueryString + " UNION ALL "
+ thirdQueryString;
combinedString.add(unionString);
secondResultSet = getResultSetFirstColumnAsString(unionString, errors, state);
} else {
secondResultSet = new ArrayList<>();
secondResultSet.addAll(getResultSetFirstColumnAsString(firstQueryString, errors, state));
secondResultSet.addAll(getResultSetFirstColumnAsString(secondQueryString, errors, state));
secondResultSet.addAll(getResultSetFirstColumnAsString(thirdQueryString, errors, state));
combinedString.add(firstQueryString);
combinedString.add(secondQueryString);
combinedString.add(thirdQueryString);
}
return secondResultSet;
}
public static List<String> getCombinedResultSetNoDuplicates(String firstQueryString, String secondQueryString,
String thirdQueryString, List<String> combinedString, boolean asUnion, SQLGlobalState<?, ?> state,
ExpectedErrors errors) throws SQLException {
String unionString;
if (asUnion) {
unionString = firstQueryString + " UNION " + secondQueryString + " UNION " + thirdQueryString;
} else {
unionString = "SELECT DISTINCT * FROM (" + firstQueryString + " UNION ALL " + secondQueryString
+ " UNION ALL " + thirdQueryString + ")";
}
List<String> secondResultSet;
combinedString.add(unionString);
secondResultSet = getResultSetFirstColumnAsString(unionString, errors, state);
return secondResultSet;
}
private static Set<String> canonicalizeFloats(List<String> values) {
Set<String> out = new HashSet<>(values.size() * 2);
for (String v : values) {
out.add(normalizeFloatString(v));
}
return out;
}
private static String normalizeFloatString(String v) {
if (v == null) {
return null;
}
boolean hasDigit = false;
boolean hasFractionMarker = false;
for (int i = 0; i < v.length(); i++) {
char c = v.charAt(i);
if (c >= '0' && c <= '9') {
hasDigit = true;
} else if (c == '.' || c == 'e' || c == 'E') {
hasFractionMarker = true;
}
}
if (!hasDigit || !hasFractionMarker) {
return v;
}
try {
double d = Double.parseDouble(v);
if (Double.isNaN(d) || Double.isInfinite(d)) {
return v;
}
return Double.toString(d);
} catch (NumberFormatException e) {
return v;
}
}
public static String canonicalizeResultValue(String value) {
if (value == null) {
return value;
}
switch (value) {
case "-0.0":
return "0.0";
case "-0":
return "0";
default:
}
return value;
}
}