| package edu.uci.ics.asterix.metadata.functions; |
| |
| import edu.uci.ics.asterix.metadata.declared.AqlCompiledDatasetDecl; |
| import edu.uci.ics.asterix.metadata.declared.AqlCompiledMetadataDeclarations; |
| import edu.uci.ics.asterix.metadata.declared.AqlMetadataProvider; |
| import edu.uci.ics.asterix.om.base.AString; |
| import edu.uci.ics.asterix.om.constants.AsterixConstantValue; |
| import edu.uci.ics.asterix.om.functions.AsterixBuiltinFunctions; |
| import edu.uci.ics.asterix.om.typecomputer.base.IResultTypeComputer; |
| import edu.uci.ics.asterix.om.types.ATypeTag; |
| import edu.uci.ics.asterix.om.types.BuiltinType; |
| import edu.uci.ics.asterix.om.types.IAType; |
| import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalExpressionTag; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.AbstractFunctionCallExpression; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.ConstantExpression; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.metadata.IMetadataProvider; |
| |
| public class MetadataBuiltinFunctions { |
| |
| static { |
| addMetadataBuiltinFunctions(); |
| AsterixBuiltinFunctions.addUnnestFun(AsterixBuiltinFunctions.DATASET, false); |
| AsterixBuiltinFunctions.addDatasetFunction(AsterixBuiltinFunctions.DATASET); |
| AsterixBuiltinFunctions.addUnnestFun(AsterixBuiltinFunctions.FEED_INGEST, false); |
| AsterixBuiltinFunctions.addDatasetFunction(AsterixBuiltinFunctions.FEED_INGEST); |
| } |
| |
| public static void addMetadataBuiltinFunctions() { |
| |
| AsterixBuiltinFunctions.add(AsterixBuiltinFunctions.DATASET, new IResultTypeComputer() { |
| |
| @Override |
| public IAType computeType(ILogicalExpression expression, IVariableTypeEnvironment env, |
| IMetadataProvider<?, ?> mp) throws AlgebricksException { |
| AbstractFunctionCallExpression f = (AbstractFunctionCallExpression) expression; |
| if (f.getArguments().size() != 1) { |
| throw new AlgebricksException("dataset arity is 1, not " + f.getArguments().size()); |
| } |
| ILogicalExpression a1 = f.getArguments().get(0).getValue(); |
| IAType t1 = (IAType) env.getType(a1); |
| if (t1.getTypeTag() == ATypeTag.ANY) { |
| return BuiltinType.ANY; |
| } |
| if (t1.getTypeTag() != ATypeTag.STRING) { |
| throw new AlgebricksException("Illegal type " + t1 + " for dataset() argument."); |
| } |
| if (a1.getExpressionTag() != LogicalExpressionTag.CONSTANT) { |
| return BuiltinType.ANY; |
| } |
| AsterixConstantValue acv = (AsterixConstantValue) ((ConstantExpression) a1).getValue(); |
| String datasetName = ((AString) acv.getObject()).getStringValue(); |
| AqlCompiledMetadataDeclarations metadata = ((AqlMetadataProvider) mp).getMetadataDeclarations(); |
| AqlCompiledDatasetDecl acdd = metadata.findDataset(datasetName); |
| if (acdd == null) { |
| throw new AlgebricksException("Could not find dataset " + datasetName); |
| } |
| String tn = acdd.getItemTypeName(); |
| IAType t2 = metadata.findType(tn); |
| if (t2 == null) { |
| throw new AlgebricksException("No type for dataset " + datasetName); |
| } |
| return t2; |
| } |
| }); |
| |
| AsterixBuiltinFunctions.add(AsterixBuiltinFunctions.FEED_INGEST, new IResultTypeComputer() { |
| |
| @Override |
| public IAType computeType(ILogicalExpression expression, IVariableTypeEnvironment env, |
| IMetadataProvider<?, ?> mp) throws AlgebricksException { |
| AbstractFunctionCallExpression f = (AbstractFunctionCallExpression) expression; |
| if (f.getArguments().size() != 1) { |
| throw new AlgebricksException("dataset arity is 1, not " + f.getArguments().size()); |
| } |
| ILogicalExpression a1 = f.getArguments().get(0).getValue(); |
| IAType t1 = (IAType) env.getType(a1); |
| if (t1.getTypeTag() == ATypeTag.ANY) { |
| return BuiltinType.ANY; |
| } |
| if (t1.getTypeTag() != ATypeTag.STRING) { |
| throw new AlgebricksException("Illegal type " + t1 + " for dataset() argument."); |
| } |
| if (a1.getExpressionTag() != LogicalExpressionTag.CONSTANT) { |
| return BuiltinType.ANY; |
| } |
| AsterixConstantValue acv = (AsterixConstantValue) ((ConstantExpression) a1).getValue(); |
| String datasetName = ((AString) acv.getObject()).getStringValue(); |
| AqlCompiledMetadataDeclarations metadata = ((AqlMetadataProvider) mp).getMetadataDeclarations(); |
| AqlCompiledDatasetDecl acdd = metadata.findDataset(datasetName); |
| if (acdd == null) { |
| throw new AlgebricksException("Could not find dataset " + datasetName); |
| } |
| String tn = acdd.getItemTypeName(); |
| IAType t2 = metadata.findType(tn); |
| if (t2 == null) { |
| throw new AlgebricksException("No type for dataset " + datasetName); |
| } |
| return t2; |
| } |
| }); |
| } |
| } |