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PrestoDefaultFunction.java
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232 lines (196 loc) · 8.29 KB
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package sqlancer.presto.ast;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import sqlancer.Randomly;
import sqlancer.presto.PrestoSchema;
import sqlancer.presto.PrestoSchema.PrestoCompositeDataType;
import sqlancer.presto.PrestoSchema.PrestoDataType;
import sqlancer.presto.gen.PrestoTypedExpressionGenerator;
public enum PrestoDefaultFunction implements PrestoFunction {
// Conditional functions
IF_TRUE("if", null) {
@Override
public boolean isCompatibleWithReturnType(PrestoSchema.PrestoCompositeDataType returnType) {
return true;
}
@Override
public PrestoSchema.PrestoDataType[] getArgumentTypes(PrestoSchema.PrestoCompositeDataType returnType) {
return new PrestoSchema.PrestoDataType[] { PrestoSchema.PrestoDataType.BOOLEAN,
returnType.getPrimitiveDataType() };
}
},
IF_TRUE_FALSE("if", null) {
@Override
public boolean isCompatibleWithReturnType(PrestoSchema.PrestoCompositeDataType returnType) {
return true;
}
@Override
public PrestoSchema.PrestoDataType[] getArgumentTypes(PrestoSchema.PrestoCompositeDataType returnType) {
return new PrestoSchema.PrestoDataType[] { PrestoSchema.PrestoDataType.BOOLEAN,
returnType.getPrimitiveDataType(), returnType.getPrimitiveDataType() };
}
},
NULLIF("nullif", null) {
@Override
public boolean isCompatibleWithReturnType(PrestoSchema.PrestoCompositeDataType returnType) {
return true;
}
@Override
public PrestoDataType[] getArgumentTypes(PrestoCompositeDataType returnType) {
return new PrestoDataType[] { returnType.getPrimitiveDataType(), returnType.getPrimitiveDataType() };
}
},
COALESCE("coalesce", null) {
@Override
public boolean isCompatibleWithReturnType(PrestoSchema.PrestoCompositeDataType returnType) {
return true;
}
@Override
public int getNumberOfArguments() {
return UNLIMITED_NO_OF_ARGUMENTS;
}
@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]);
}
@Override
public List<PrestoExpression> getArgumentsForReturnType(PrestoTypedExpressionGenerator gen, int depth,
PrestoDataType[] argumentTypes, PrestoCompositeDataType returnType) {
return super.getArgumentsForReturnType(gen, depth, argumentTypes, returnType);
}
},
// 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 UNLIMITED_NO_OF_ARGUMENTS;
}
@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 UNLIMITED_NO_OF_ARGUMENTS;
}
@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 static final int UNLIMITED_NO_OF_ARGUMENTS = -1;
private final PrestoDataType returnType;
private final PrestoDataType[] argumentTypes;
private final String functionName;
PrestoDefaultFunction(String functionName, PrestoDataType returnType) {
this.functionName = functionName;
this.returnType = returnType;
this.argumentTypes = new PrestoDataType[0];
}
PrestoDefaultFunction(PrestoDataType returnType) {
this.returnType = returnType;
this.argumentTypes = new PrestoDataType[0];
this.functionName = toString();
}
PrestoDefaultFunction(PrestoDataType returnType, PrestoDataType... argumentTypes) {
this.returnType = returnType;
this.argumentTypes = argumentTypes.clone();
this.functionName = toString();
}
PrestoDefaultFunction(String functionName, PrestoDataType returnType, PrestoDataType... argumentTypes) {
this.functionName = functionName;
this.returnType = returnType;
this.argumentTypes = argumentTypes.clone();
}
public static List<PrestoDefaultFunction> getFunctionsCompatibleWith(PrestoCompositeDataType returnType) {
return Stream.of(values()).filter(f -> f.isCompatibleWithReturnType(returnType)).collect(Collectors.toList());
}
@Override
public String getFunctionName() {
return functionName;
}
@Override
public int getNumberOfArguments() {
return argumentTypes == null ? 0 : argumentTypes.length;
}
@Override
public boolean isCompatibleWithReturnType(PrestoCompositeDataType returnType) {
return this.returnType == returnType.getPrimitiveDataType();
}
@Override
public PrestoDataType[] getArgumentTypes(PrestoCompositeDataType returnType) {
return argumentTypes.clone();
}
@Override
public List<PrestoExpression> getArgumentsForReturnType(PrestoTypedExpressionGenerator gen, int depth,
PrestoDataType[] argumentTypes, PrestoCompositeDataType returnType) {
List<PrestoExpression> arguments = new ArrayList<>();
// This is a workaround based on the assumption that array types should refer to the same element type.
PrestoCompositeDataType savedArrayType = null;
if (returnType.getPrimitiveDataType() == PrestoDataType.ARRAY) {
savedArrayType = returnType;
}
if (getNumberOfArguments() == UNLIMITED_NO_OF_ARGUMENTS) {
PrestoDataType dataType = getArgumentTypes(returnType)[0];
// TODO: consider upper
long no = Randomly.getNotCachedInteger(2, 10);
for (int i = 0; i < no; i++) {
PrestoCompositeDataType type;
if (dataType == PrestoDataType.ARRAY) {
if (savedArrayType == null) {
savedArrayType = dataType.get();
}
type = savedArrayType;
} else {
type = PrestoCompositeDataType.fromDataType(dataType);
}
arguments.add(gen.generateExpression(type, depth + 1));
}
} else {
for (PrestoDataType arg : argumentTypes) {
PrestoCompositeDataType type;
if (arg == PrestoDataType.ARRAY) {
if (savedArrayType == null) {
savedArrayType = arg.get();
}
type = savedArrayType;
} else {
type = PrestoCompositeDataType.fromDataType(arg);
}
arguments.add(gen.generateExpression(type, depth + 1));
}
}
return arguments;
}
@Override
public String toString() {
if (functionName != null) {
return functionName;
}
return super.toString();
}
}