@Override
public Expression visitUnion(UnionNode node, Void context) {
Expression firstUnderlyingPredicate = node.getSources().get(0).accept(this, context);
// Rewrite in terms of output symbols
Expression firstOutputPredicate =
ExpressionTreeRewriter.rewriteWith(
new ExpressionSymbolInliner(node.outputSymbolMap(0)), firstUnderlyingPredicate);
Set<Expression> conjuncts = ImmutableSet.copyOf(extractConjuncts(firstOutputPredicate));
// Find the intersection of all predicates
for (int i = 1; i < node.getSources().size(); i++) {
Expression underlyingPredicate = node.getSources().get(i).accept(this, context);
// Rewrite in terms of output symbols
Expression outputPredicate =
ExpressionTreeRewriter.rewriteWith(
new ExpressionSymbolInliner(node.outputSymbolMap(i)), underlyingPredicate);
// TODO: use a more precise way to determine overlapping conjuncts (e.g. commutative
// predicates)
conjuncts =
Sets.intersection(conjuncts, ImmutableSet.copyOf(extractConjuncts(outputPredicate)));
}
return combineConjuncts(conjuncts);
}
private OperatorFactory compileFilterProject(
Expression filter, Expression projection, ExpressionCompiler compiler) {
filter = ExpressionTreeRewriter.rewriteWith(new SymbolToInputRewriter(INPUT_MAPPING), filter);
projection =
ExpressionTreeRewriter.rewriteWith(new SymbolToInputRewriter(INPUT_MAPPING), projection);
IdentityHashMap<Expression, Type> expressionTypes =
getExpressionTypesFromInput(
TEST_SESSION, metadata, SQL_PARSER, INPUT_TYPES, ImmutableList.of(filter, projection));
try {
List<RowExpression> projections =
ImmutableList.of(toRowExpression(projection, expressionTypes));
PageProcessor processor =
compiler.compilePageProcessor(toRowExpression(filter, expressionTypes), projections);
return new FilterAndProjectOperator.FilterAndProjectOperatorFactory(
0, processor, ImmutableList.of(expressionTypes.get(projection)));
} catch (Throwable e) {
if (e instanceof UncheckedExecutionException) {
e = e.getCause();
}
throw new RuntimeException("Error compiling " + projection + ": " + e.getMessage(), e);
}
}
public PlanBuilder appendProjections(
Iterable<Expression> expressions,
SymbolAllocator symbolAllocator,
PlanNodeIdAllocator idAllocator) {
TranslationMap translations = copyTranslations();
ImmutableMap.Builder<Symbol, Expression> projections = ImmutableMap.builder();
// add an identity projection for underlying plan
for (Symbol symbol : getRoot().getOutputSymbols()) {
projections.put(symbol, symbol.toSymbolReference());
}
ImmutableMap.Builder<Symbol, Expression> newTranslations = ImmutableMap.builder();
ParameterRewriter parameterRewriter = new ParameterRewriter(parameters, getAnalysis());
for (Expression expression : expressions) {
Expression rewritten = ExpressionTreeRewriter.rewriteWith(parameterRewriter, expression);
translations.addIntermediateMapping(expression, rewritten);
Symbol symbol =
symbolAllocator.newSymbol(rewritten, getAnalysis().getTypeWithCoercions(expression));
projections.put(symbol, translations.rewrite(rewritten));
newTranslations.put(symbol, rewritten);
}
// Now append the new translations into the TranslationMap
for (Map.Entry<Symbol, Expression> entry : newTranslations.build().entrySet()) {
translations.put(entry.getValue(), entry.getKey());
}
return new PlanBuilder(
translations,
new ProjectNode(idAllocator.getNextId(), getRoot(), projections.build()),
parameters);
}
@Override
public PlanNode rewriteProject(
ProjectNode node, Expression inheritedPredicate, PlanRewriter<Expression> planRewriter) {
Expression inlinedPredicate =
ExpressionTreeRewriter.rewriteWith(
new ExpressionSymbolInliner(node.getOutputMap()), inheritedPredicate);
return planRewriter.defaultRewrite(node, inlinedPredicate);
}
public static Expression createExpression(
String expression, Metadata metadata, Map<Symbol, Type> symbolTypes) {
Expression parsedExpression = SQL_PARSER.createExpression(expression);
final ExpressionAnalysis analysis =
analyzeExpressionsWithSymbols(
TEST_SESSION, metadata, SQL_PARSER, symbolTypes, ImmutableList.of(parsedExpression));
Expression rewrittenExpression =
ExpressionTreeRewriter.rewriteWith(
new ExpressionRewriter<Void>() {
@Override
public Expression rewriteExpression(
Expression node, Void context, ExpressionTreeRewriter<Void> treeRewriter) {
Expression rewrittenExpression = treeRewriter.defaultRewrite(node, context);
// cast expression if coercion is registered
Type coercion = analysis.getCoercion(node);
if (coercion != null) {
rewrittenExpression =
new Cast(rewrittenExpression, coercion.getTypeSignature().toString());
}
return rewrittenExpression;
}
@Override
public Expression rewriteDereferenceExpression(
DereferenceExpression node,
Void context,
ExpressionTreeRewriter<Void> treeRewriter) {
if (analysis.getColumnReferences().contains(node)) {
return rewriteExpression(node, context, treeRewriter);
}
// Rewrite all row field reference to function call.
QualifiedName mangledName =
QualifiedName.of(mangleFieldReference(node.getFieldName()));
FunctionCall functionCall =
new FunctionCall(mangledName, ImmutableList.of(node.getBase()));
Expression rewrittenExpression =
rewriteFunctionCall(functionCall, context, treeRewriter);
// cast expression if coercion is registered
Type coercion = analysis.getCoercion(node);
if (coercion != null) {
rewrittenExpression =
new Cast(rewrittenExpression, coercion.getTypeSignature().toString());
}
return rewrittenExpression;
}
},
parsedExpression);
return canonicalizeExpression(rewrittenExpression);
}
public static Object evaluatePropertyValue(
Expression expression,
Type expectedType,
Session session,
Metadata metadata,
List<Expression> parameters) {
Expression rewritten =
ExpressionTreeRewriter.rewriteWith(new ParameterRewriter(parameters), expression);
Object value =
evaluateConstantExpression(rewritten, expectedType, metadata, session, parameters);
// convert to object value type of SQL type
BlockBuilder blockBuilder = expectedType.createBlockBuilder(new BlockBuilderStatus(), 1);
writeNativeValue(expectedType, blockBuilder, value);
Object objectValue = expectedType.getObjectValue(session.toConnectorSession(), blockBuilder, 0);
if (objectValue == null) {
throw new PrestoException(
INVALID_SESSION_PROPERTY, "Session property value must not be null");
}
return objectValue;
}
@Override
public PlanNode rewriteUnion(
UnionNode node, Expression inheritedPredicate, PlanRewriter<Expression> planRewriter) {
boolean modified = false;
ImmutableList.Builder<PlanNode> builder = ImmutableList.builder();
for (int i = 0; i < node.getSources().size(); i++) {
Expression sourcePredicate =
ExpressionTreeRewriter.rewriteWith(
new ExpressionSymbolInliner(node.sourceSymbolMap(i)), inheritedPredicate);
PlanNode source = node.getSources().get(i);
PlanNode rewrittenSource = planRewriter.rewrite(source, sourcePredicate);
if (rewrittenSource != source) {
modified = true;
}
builder.add(rewrittenSource);
}
if (modified) {
return new UnionNode(node.getId(), builder.build(), node.getSymbolMapping());
}
return node;
}
private OperatorFactory compileFilterWithNoInputColumns(
Expression filter, ExpressionCompiler compiler) {
filter =
ExpressionTreeRewriter.rewriteWith(
new SymbolToInputRewriter(ImmutableMap.<Symbol, Integer>of()), filter);
IdentityHashMap<Expression, Type> expressionTypes =
getExpressionTypesFromInput(
TEST_SESSION, metadata, SQL_PARSER, INPUT_TYPES, ImmutableList.of(filter));
try {
PageProcessor processor =
compiler.compilePageProcessor(
toRowExpression(filter, expressionTypes), ImmutableList.of());
return new FilterAndProjectOperator.FilterAndProjectOperatorFactory(
0, processor, ImmutableList.<Type>of());
} catch (Throwable e) {
if (e instanceof UncheckedExecutionException) {
e = e.getCause();
}
throw new RuntimeException("Error compiling " + filter + ": " + e.getMessage(), e);
}
}
