LanceIndexPrewarmMetadata.java

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// to you under the Apache License, Version 2.0 (the
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//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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package org.apache.doris.datasource.lance.metadata;

import org.apache.arrow.vector.types.pojo.Schema;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.OptionalInt;

/** Names and field IDs for prewarm, independent of planner-only index descriptions. */
public final class LanceIndexPrewarmMetadata {
    private final LanceTableAccess access;
    private final long version;
    private final Schema schema;
    private final Map<String, Integer> fieldIds;
    private final Map<String, List<Integer>> indexFields;

    public LanceIndexPrewarmMetadata(LanceTableAccess access, long version, Schema schema,
            Map<String, Integer> fieldIds, Map<String, List<Integer>> indexFields) {
        this.access = access;
        this.version = version;
        this.schema = schema;
        this.fieldIds = Collections.unmodifiableMap(new HashMap<>(fieldIds));
        Map<String, List<Integer>> copied = new LinkedHashMap<>();
        indexFields.forEach((name, fields) -> copied.put(name,
                Collections.unmodifiableList(new ArrayList<>(fields))));
        this.indexFields = Collections.unmodifiableMap(copied);
    }

    public String getDatasetUri() {
        return access.getDatasetUri();
    }

    public long getVersion() {
        return version;
    }

    public Schema getSchema() {
        return schema;
    }

    public OptionalInt getLanceFieldId(String fieldName) {
        Integer id = fieldIds.get(fieldName);
        return id == null ? OptionalInt.empty() : OptionalInt.of(id);
    }

    public Map<String, List<Integer>> getIndexFields() {
        return indexFields;
    }

    public Map<String, String> getLanceStorageOptions() {
        return access.getStorageOptions();
    }
}