Examples with ExpressionAnalysis com.facebook.presto.sql.analyzer.ExpressionAnalysis used on opensource projects

Example 1 with ExpressionAnalysis

use of com.facebook.presto.sql.analyzer.ExpressionAnalysis in project presto by prestodb.

the class FunctionAssertions method createExpression.

public static Expression createExpression(String expression, Metadata metadata, Map<Symbol, Type> symbolTypes) {
    Expression parsedExpression = SQL_PARSER.createExpression(expression);
    parsedExpression = rewriteIdentifiersToSymbolReferences(parsedExpression);
    final ExpressionAnalysis analysis = analyzeExpressionsWithSymbols(TEST_SESSION, metadata, SQL_PARSER, symbolTypes, ImmutableList.of(parsedExpression), emptyList(), false);
    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(), false, analysis.isTypeOnlyCoercion(node));
            }
            return rewrittenExpression;
        }

        @Override
        public Expression rewriteDereferenceExpression(DereferenceExpression node, Void context, ExpressionTreeRewriter<Void> treeRewriter) {
            if (analysis.getColumnReferences().contains(node)) {
                return rewriteExpression(node, context, 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;
        }
    }, parsedExpression);
    return canonicalizeExpression(rewrittenExpression);
}

Example 2 with ExpressionAnalysis

use of com.facebook.presto.sql.analyzer.ExpressionAnalysis in project presto by prestodb.

the class FunctionAssertions method createExpression.

public static Expression createExpression(Session session, String expression, Metadata metadata, TypeProvider symbolTypes) {
    Expression parsedExpression = SQL_PARSER.createExpression(expression, createParsingOptions(session));
    parsedExpression = rewriteIdentifiersToSymbolReferences(parsedExpression);
    final ExpressionAnalysis analysis = analyzeExpressions(session, metadata, SQL_PARSER, symbolTypes, ImmutableList.of(parsedExpression), ImmutableList.of(), WarningCollector.NOOP, false);
    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(), false, analysis.isTypeOnlyCoercion(node));
            }
            return rewrittenExpression;
        }

        @Override
        public Expression rewriteDereferenceExpression(DereferenceExpression node, Void context, ExpressionTreeRewriter<Void> treeRewriter) {
            if (analysis.isColumnReference(node)) {
                return rewriteExpression(node, context, 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;
        }
    }, parsedExpression);
    return canonicalizeExpression(rewrittenExpression);
}

Example 3 with ExpressionAnalysis

use of com.facebook.presto.sql.analyzer.ExpressionAnalysis in project presto by prestodb.

the class SqlFunctionUtils method getSqlFunctionImplementationExpression.

private static Expression getSqlFunctionImplementationExpression(FunctionMetadata functionMetadata, SqlInvokedScalarFunctionImplementation implementation, Metadata metadata, PlanVariableAllocator variableAllocator, SqlFunctionProperties sqlFunctionProperties, Map<String, VariableReferenceExpression> argumentVariables) {
    checkArgument(functionMetadata.getImplementationType().equals(SQL), format("Expect SQL function, get %s", functionMetadata.getImplementationType()));
    checkArgument(functionMetadata.getArgumentNames().isPresent(), "ArgumentNames is missing");
    Expression expression = normalizeParameters(functionMetadata.getArgumentNames().get(), parseSqlFunctionExpression(implementation, sqlFunctionProperties));
    ExpressionAnalysis functionAnalysis = analyzeSqlFunctionExpression(metadata, sqlFunctionProperties, expression, argumentVariables.entrySet().stream().collect(toImmutableMap(Map.Entry::getKey, entry -> entry.getValue().getType())));
    expression = coerceIfNecessary(expression, functionAnalysis);
    return rewriteLambdaExpression(expression, argumentVariables, functionAnalysis, variableAllocator);
}

Example 4 with ExpressionAnalysis

use of com.facebook.presto.sql.analyzer.ExpressionAnalysis in project presto by prestodb.

the class SqlFunctionUtils method rewriteLambdaExpression.

private static Expression rewriteLambdaExpression(Expression sqlFunction, Map<String, VariableReferenceExpression> arguments, ExpressionAnalysis functionAnalysis, PlanVariableAllocator variableAllocator) {
    Map<NodeRef<Identifier>, LambdaArgumentDeclaration> lambdaArgumentReferences = functionAnalysis.getLambdaArgumentReferences();
    Map<NodeRef<Expression>, Type> expressionTypes = functionAnalysis.getExpressionTypes();
    // Rewrite reference to LambdaArgumentDeclaration
    Map<NodeRef<LambdaArgumentDeclaration>, VariableReferenceExpression> variables = expressionTypes.entrySet().stream().filter(entry -> entry.getKey().getNode() instanceof LambdaArgumentDeclaration).distinct().collect(toImmutableMap(entry -> NodeRef.of((LambdaArgumentDeclaration) entry.getKey().getNode()), entry -> variableAllocator.newVariable(((LambdaArgumentDeclaration) entry.getKey().getNode()).getName(), entry.getValue(), "lambda")));
    Expression rewritten = ExpressionTreeRewriter.rewriteWith(new ExpressionRewriter<Map<NodeRef<Identifier>, LambdaArgumentDeclaration>>() {

        @Override
        public Expression rewriteLambdaExpression(LambdaExpression node, Map<NodeRef<Identifier>, LambdaArgumentDeclaration> context, ExpressionTreeRewriter<Map<NodeRef<Identifier>, LambdaArgumentDeclaration>> treeRewriter) {
            return new LambdaExpression(node.getArguments().stream().map(argument -> new LambdaArgumentDeclaration(new Identifier(variables.get(NodeRef.of(argument)).getName()))).collect(toImmutableList()), treeRewriter.rewrite(node.getBody(), context));
        }

        @Override
        public Expression rewriteIdentifier(Identifier node, Map<NodeRef<Identifier>, LambdaArgumentDeclaration> context, ExpressionTreeRewriter<Map<NodeRef<Identifier>, LambdaArgumentDeclaration>> treeRewriter) {
            NodeRef<Identifier> ref = NodeRef.of(node);
            if (context.containsKey(ref)) {
                return createSymbolReference(variables.get(NodeRef.of(context.get(ref))));
            }
            return node;
        }
    }, sqlFunction, lambdaArgumentReferences);
    // Rewrite function input referenced in lambda
    rewritten = ExpressionTreeRewriter.rewriteWith(new ExpressionRewriter<Map<String, VariableReferenceExpression>>() {

        @Override
        public Expression rewriteIdentifier(Identifier node, Map<String, VariableReferenceExpression> context, ExpressionTreeRewriter<Map<String, VariableReferenceExpression>> treeRewriter) {
            if (context.containsKey(node.getValue())) {
                return createSymbolReference(context.get(node.getValue()));
            }
            return node;
        }
    }, rewritten, arguments);
    // Desugar lambda capture
    return LambdaCaptureDesugaringRewriter.rewrite(rewritten, variableAllocator);
}