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Julien Ruaux
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Mar 24, 2022
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subprojects/trino-redisearch/src/main/java/com/redis/trino/MetricAggregation.java
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|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| package com.redis.trino; | ||
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| import static io.trino.spi.type.BigintType.BIGINT; | ||
| import static io.trino.spi.type.DoubleType.DOUBLE; | ||
| import static io.trino.spi.type.IntegerType.INTEGER; | ||
| import static io.trino.spi.type.RealType.REAL; | ||
| import static io.trino.spi.type.SmallintType.SMALLINT; | ||
| import static io.trino.spi.type.TinyintType.TINYINT; | ||
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| import java.util.Arrays; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.Objects; | ||
| import java.util.Optional; | ||
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| import com.fasterxml.jackson.annotation.JsonCreator; | ||
| import com.fasterxml.jackson.annotation.JsonProperty; | ||
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| import io.trino.spi.connector.AggregateFunction; | ||
| import io.trino.spi.connector.ColumnHandle; | ||
| import io.trino.spi.expression.Variable; | ||
| import io.trino.spi.type.Type; | ||
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| public class MetricAggregation { | ||
| public static final String MAX = "max"; | ||
| public static final String MIN = "min"; | ||
| public static final String AVG = "avg"; | ||
| public static final String SUM = "sum"; | ||
| public static final String COUNT = "count"; | ||
| private static final List<String> SUPPORTED_AGGREGATION_FUNCTIONS = Arrays.asList(MAX, MIN, AVG, SUM, COUNT); | ||
| private static final List<Type> NUMERIC_TYPES = Arrays.asList(REAL, DOUBLE, TINYINT, SMALLINT, INTEGER, BIGINT); | ||
| private final String functionName; | ||
| private final Type outputType; | ||
| private final Optional<RediSearchColumnHandle> columnHandle; | ||
| private final String alias; | ||
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| @JsonCreator | ||
| public MetricAggregation(@JsonProperty("functionName") String functionName, | ||
| @JsonProperty("outputType") Type outputType, | ||
| @JsonProperty("columnHandle") Optional<RediSearchColumnHandle> columnHandle, | ||
| @JsonProperty("alias") String alias) { | ||
| this.functionName = functionName; | ||
| this.outputType = outputType; | ||
| this.columnHandle = columnHandle; | ||
| this.alias = alias; | ||
| } | ||
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| @JsonProperty | ||
| public String getFunctionName() { | ||
| return functionName; | ||
| } | ||
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| @JsonProperty | ||
| public Type getOutputType() { | ||
| return outputType; | ||
| } | ||
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| @JsonProperty | ||
| public Optional<RediSearchColumnHandle> getColumnHandle() { | ||
| return columnHandle; | ||
| } | ||
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| @JsonProperty | ||
| public String getAlias() { | ||
| return alias; | ||
| } | ||
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| public static boolean isNumericType(Type type) { | ||
| return NUMERIC_TYPES.contains(type); | ||
| } | ||
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| public static Optional<MetricAggregation> handleAggregation(AggregateFunction function, | ||
| Map<String, ColumnHandle> assignments, String alias) { | ||
| if (!SUPPORTED_AGGREGATION_FUNCTIONS.contains(function.getFunctionName())) { | ||
| return Optional.empty(); | ||
| } | ||
| // check | ||
| // 1. Function input can be found in assignments | ||
| // 2. Target type of column being aggregate must be numeric type | ||
| // 3. ColumnHandle support predicates(since text treats as VARCHAR, but text can | ||
| // not be treats as term in es by default | ||
| Optional<RediSearchColumnHandle> parameterColumnHandle = function.getArguments().stream() | ||
| .filter(Variable.class::isInstance).map(Variable.class::cast).map(Variable::getName) | ||
| .filter(assignments::containsKey).findFirst().map(assignments::get) | ||
| .map(RediSearchColumnHandle.class::cast) | ||
| .filter(column -> MetricAggregation.isNumericType(column.getType())); | ||
| // only count can accept empty ElasticsearchColumnHandle | ||
| if (!COUNT.equals(function.getFunctionName()) && parameterColumnHandle.isEmpty()) { | ||
| return Optional.empty(); | ||
| } | ||
| return Optional.of(new MetricAggregation(function.getFunctionName(), function.getOutputType(), | ||
| parameterColumnHandle, alias)); | ||
| } | ||
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| @Override | ||
| public boolean equals(Object o) { | ||
| if (this == o) { | ||
| return true; | ||
| } | ||
| if (o == null || getClass() != o.getClass()) { | ||
| return false; | ||
| } | ||
| MetricAggregation that = (MetricAggregation) o; | ||
| return Objects.equals(functionName, that.functionName) && Objects.equals(outputType, that.outputType) | ||
| && Objects.equals(columnHandle, that.columnHandle) && Objects.equals(alias, that.alias); | ||
| } | ||
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| @Override | ||
| public int hashCode() { | ||
| return Objects.hash(functionName, outputType, columnHandle, alias); | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| return String.format("%s(%s)", functionName, columnHandle.map(RediSearchColumnHandle::getName).orElse("")); | ||
| } | ||
| } |
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