private TPreparedExpression assembleFunction(
ExpressionNode functionNode,
String functionName,
List<ExpressionNode> argumentNodes,
ColumnExpressionContext columnContext,
SubqueryOperatorAssembler subqueryAssembler) {
List<TPreparedExpression> arguments =
assembleExpressions(argumentNodes, columnContext, subqueryAssembler);
TValidatedScalar overload;
SparseArray<Object> preptimeValues = null;
if (functionNode instanceof FunctionExpression) {
FunctionExpression fexpr = (FunctionExpression) functionNode;
overload = fexpr.getResolved();
preptimeValues = fexpr.getPreptimeValues();
} else if (functionNode instanceof BooleanOperationExpression) {
List<TPreptimeValue> inputPreptimeValues = new ArrayList<>(argumentNodes.size());
for (ExpressionNode argument : argumentNodes) {
inputPreptimeValues.add(argument.getPreptimeValue());
}
OverloadResolver<TValidatedScalar> scalarsResolver = registryService.getScalarsResolver();
OverloadResult<TValidatedScalar> overloadResult =
scalarsResolver.get(functionName, inputPreptimeValues);
overload = overloadResult.getOverload();
} else if (functionNode instanceof IfElseExpression) {
overload = ifElseValidated;
} else {
throw new AssertionError(functionNode);
}
TInstance resultInstance = functionNode.getType();
return new TPreparedFunction(overload, resultInstance, arguments, preptimeValues);
}
public TPreparedExpression assembleExpression(
ExpressionNode node,
ColumnExpressionContext columnContext,
SubqueryOperatorAssembler subqueryAssembler) {
TPreparedExpression possiblyLiteral = tryLiteral(node);
if (possiblyLiteral != null) return possiblyLiteral;
if (node instanceof ConstantExpression) return literal(((ConstantExpression) node));
else if (node instanceof ColumnExpression)
return assembleColumnExpression((ColumnExpression) node, columnContext);
else if (node instanceof ParameterExpression) return variable((ParameterExpression) node);
else if (node instanceof BooleanOperationExpression) {
BooleanOperationExpression bexpr = (BooleanOperationExpression) node;
return assembleFunction(
bexpr,
bexpr.getOperation().getFunctionName(),
Arrays.<ExpressionNode>asList(bexpr.getLeft(), bexpr.getRight()),
columnContext,
subqueryAssembler);
} else if (node instanceof CastExpression)
return assembleCastExpression((CastExpression) node, columnContext, subqueryAssembler);
else if (node instanceof ComparisonCondition) {
ComparisonCondition cond = (ComparisonCondition) node;
TPreparedExpression left =
assembleExpression(cond.getLeft(), columnContext, subqueryAssembler);
TPreparedExpression right =
assembleExpression(cond.getRight(), columnContext, subqueryAssembler);
// never use a collator if we have a KeyComparable
AkCollator collator = (cond.getKeyComparable() == null) ? collator(cond, left, right) : null;
if (collator != null) return collate(left, cond.getOperation(), right, collator);
else return compare(left, cond, right);
} else if (node instanceof FunctionExpression) {
FunctionExpression funcNode = (FunctionExpression) node;
return assembleFunction(
funcNode,
funcNode.getFunction(),
funcNode.getOperands(),
columnContext,
subqueryAssembler);
} else if (node instanceof IfElseExpression) {
IfElseExpression ifElse = (IfElseExpression) node;
return assembleFunction(
ifElse,
"if",
Arrays.asList(
ifElse.getTestCondition(), ifElse.getThenExpression(), ifElse.getElseExpression()),
columnContext,
subqueryAssembler);
} else if (node instanceof InListCondition) {
InListCondition inList = (InListCondition) node;
TPreparedExpression lhs =
assembleExpression(inList.getOperand(), columnContext, subqueryAssembler);
List<TPreparedExpression> rhs =
assembleExpressions(inList.getExpressions(), columnContext, subqueryAssembler);
return in(lhs, rhs, inList);
} else if (node instanceof RoutineExpression) {
RoutineExpression routineNode = (RoutineExpression) node;
return assembleRoutine(
routineNode,
routineNode.getRoutine(),
routineNode.getOperands(),
columnContext,
subqueryAssembler);
} else if (node instanceof SubqueryExpression)
return subqueryAssembler.assembleSubqueryExpression((SubqueryExpression) node);
else if (node instanceof AggregateFunctionExpression)
throw new UnsupportedSQLException("Aggregate used as regular function", node.getSQLsource());
else if (node instanceof ColumnDefaultExpression)
return assembleColumnDefault(((ColumnDefaultExpression) node).getColumn(), null);
else if (node instanceof IsNullIndexKey) return new TNullExpression(node.getType());
else throw new UnsupportedSQLException("Unknown expression", node.getSQLsource());
}