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PrestoComparisonFunction.java
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81 lines (66 loc) · 2.61 KB
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package sqlancer.presto.ast;
import java.util.ArrayList;
import sqlancer.Randomly;
import sqlancer.presto.PrestoSchema;
import sqlancer.presto.PrestoSchema.PrestoCompositeDataType;
import sqlancer.presto.PrestoSchema.PrestoDataType;
public enum PrestoComparisonFunction implements PrestoFunction {
// comparison
// Returns the largest of the provided values.
// → [same as input]
GREATEST("greatest", null) {
@Override
public boolean isCompatibleWithReturnType(PrestoSchema.PrestoCompositeDataType returnType) {
return PrestoDataType.getOrderableTypes().contains(returnType.getPrimitiveDataType());
}
@Override
public int getNumberOfArguments() {
return -1;
}
@Override
public PrestoSchema.PrestoDataType[] getArgumentTypes(PrestoSchema.PrestoCompositeDataType returnType) {
return new PrestoSchema.PrestoDataType[] { returnType.getPrimitiveDataType() };
}
},
// Returns the smallest of the provided values.
// → [same as input]#
LEAST("least", null) {
@Override
public boolean isCompatibleWithReturnType(PrestoSchema.PrestoCompositeDataType returnType) {
return PrestoDataType.getOrderableTypes().contains(returnType.getPrimitiveDataType());
}
@Override
public int getNumberOfArguments() {
return -1;
}
@Override
public PrestoDataType[] getArgumentTypes(PrestoCompositeDataType returnType) {
ArrayList<PrestoDataType> prestoDataTypes = new ArrayList<>();
long no = Randomly.getNotCachedInteger(2, 10);
for (int i = 0; i < no; i++) {
prestoDataTypes.add(returnType.getPrimitiveDataType());
}
return prestoDataTypes.toArray(new PrestoDataType[0]);
}
};
private final PrestoDataType returnType;
private final PrestoDataType[] argumentTypes;
private final String functionName;
PrestoComparisonFunction(String functionName, PrestoDataType returnType, PrestoDataType... argumentTypes) {
this.functionName = functionName;
this.returnType = returnType;
this.argumentTypes = argumentTypes.clone();
}
@Override
public String getFunctionName() {
return functionName;
}
@Override
public boolean isCompatibleWithReturnType(PrestoCompositeDataType returnType) {
return this.returnType == returnType.getPrimitiveDataType();
}
@Override
public PrestoDataType[] getArgumentTypes(PrestoCompositeDataType returnType) {
return argumentTypes.clone();
}
}