@tanstack/db-ivm/dist/cjs/indexes.cjs.map

Incremental View Maintenance for TanStack DB based on Differential Dataflow

{"version":3,"file":"indexes.cjs","sources":["../../src/indexes.ts"],"sourcesContent":["/**\n * # Optimized Index Data Structure\n *\n * Multi-level index that adapts storage strategy based on data patterns to minimize memory\n * usage, eliminate wasteful lookups, and avoid hashing whenever possible.\n *\n * ## Storage Strategy\n *\n * **Single value**: `IndexMap['key'] → [value, multiplicity]` (no hashing needed)\n *\n * **Multiple unprefixed values**: Direct ValueMap (avoids NO_PREFIX lookup)\n * ```\n * IndexMap['key'] → ValueMap { hash(value1) → [value1, mult1], ... }\n * ```\n *\n * **Values with prefixes**: PrefixMap uses prefix keys directly (no hashing)\n * ```\n * IndexMap['key'] → PrefixMap { 'prefix1' → [value1, mult1], NO_PREFIX → ValueMap{...} }\n * ```\n *\n * **Multiple values per prefix**: ValueMap within PrefixMap (hash only suffixes)\n * ```\n * PrefixMap['prefix'] → ValueMap { hash(suffix1) → [full_value1, mult1], ... }\n * ```\n *\n * ## Dynamic Evolution\n *\n * Structure automatically evolves as data is added:\n * - Single → ValueMap (when both values unprefixed)\n * - Single → PrefixMap (when at least one prefixed)\n * - ValueMap → PrefixMap (adding prefixed value to unprefixed)\n *\n * Prefixes extracted from array values: `['prefix', 'suffix']` → prefix='prefix'\n */\n\nimport { MultiSet } from './multiset.js'\nimport { hash } from './hashing/index.js'\nimport type { Hash } from './hashing/index.js'\n\n// We use a symbol to represent the absence of a prefix, unprefixed values a stored\n// against this key.\nconst NO_PREFIX = Symbol(`NO_PREFIX`)\ntype NO_PREFIX = typeof NO_PREFIX\n\n// A single value is a tuple of the value and the multiplicity.\ntype SingleValue<TValue> = [TValue, number]\n\n// Base map type for the index. Stores single values, prefix maps, or value maps against a key.\ntype IndexMap<TKey, TValue, TPrefix> = Map<\n  TKey,\n  SingleValue<TValue> | PrefixMap<TValue, TPrefix> | ValueMap<TValue>\n>\n\n// Second level map type for the index, stores single values or value maps against a prefix.\nclass PrefixMap<TValue, TPrefix> extends Map<\n  TPrefix | NO_PREFIX,\n  SingleValue<TValue> | ValueMap<TValue>\n> {\n  /**\n   * Add a value to the PrefixMap. Returns true if the map becomes empty after the operation.\n   */\n  addValue(value: TValue, multiplicity: number): boolean {\n    if (multiplicity === 0) return this.size === 0\n\n    const prefix = getPrefix<TValue, TPrefix>(value)\n    const valueMapOrSingleValue = this.get(prefix)\n\n    if (isSingleValue(valueMapOrSingleValue)) {\n      const [currentValue, currentMultiplicity] = valueMapOrSingleValue\n      const currentPrefix = getPrefix<TValue, TPrefix>(currentValue)\n\n      if (currentPrefix !== prefix) {\n        throw new Error(`Mismatching prefixes, this should never happen`)\n      }\n\n      if (currentValue === value || hash(currentValue) === hash(value)) {\n        // Same value, update multiplicity\n        const newMultiplicity = currentMultiplicity + multiplicity\n        if (newMultiplicity === 0) {\n          this.delete(prefix)\n        } else {\n          this.set(prefix, [value, newMultiplicity])\n        }\n      } else {\n        // Different suffixes, need to create ValueMap\n        const valueMap = new ValueMap<TValue>()\n        valueMap.set(hash(currentValue), valueMapOrSingleValue)\n        valueMap.set(hash(value), [value, multiplicity])\n        this.set(prefix, valueMap)\n      }\n    } else if (valueMapOrSingleValue === undefined) {\n      // No existing value for this prefix\n      this.set(prefix, [value, multiplicity])\n    } else {\n      // Existing ValueMap\n      const isEmpty = valueMapOrSingleValue.addValue(value, multiplicity)\n      if (isEmpty) {\n        this.delete(prefix)\n      }\n    }\n\n    return this.size === 0\n  }\n}\n\n// Third level map type for the index, stores single values or value maps against a hash.\nclass ValueMap<TValue> extends Map<Hash, [TValue, number]> {\n  /**\n   * Add a value to the ValueMap. Returns true if the map becomes empty after the operation.\n   * @param value - The full value to store\n   * @param multiplicity - The multiplicity to add\n   * @param hashKey - Optional hash key to use instead of hashing the full value (used when in PrefixMap context)\n   */\n  addValue(value: TValue, multiplicity: number): boolean {\n    if (multiplicity === 0) return this.size === 0\n\n    const key = hash(value)\n    const currentValue = this.get(key)\n\n    if (currentValue) {\n      const [, currentMultiplicity] = currentValue\n      const newMultiplicity = currentMultiplicity + multiplicity\n      if (newMultiplicity === 0) {\n        this.delete(key)\n      } else {\n        this.set(key, [value, newMultiplicity])\n      }\n    } else {\n      this.set(key, [value, multiplicity])\n    }\n\n    return this.size === 0\n  }\n}\n\n/**\n * A map from a difference collection trace's keys -> (value, multiplicities) that changed.\n * Used in operations like join and reduce where the operation needs to\n * exploit the key-value structure of the data to run efficiently.\n */\nexport class Index<TKey, TValue, TPrefix = any> {\n  /*\n   * This index maintains a nested map of keys -> (value, multiplicities), where:\n   * - initially the values are stored against the key as a single value tuple\n   * - when a key gets additional values, the values are stored against the key in a\n   *   prefix map\n   * - the prefix is extract where possible from values that are structured as\n   *   [rowPrimaryKey, rowValue], as they are in the Tanstack DB query pipeline.\n   * - only when there are multiple values for a given prefix do we fall back to a\n   *   hash to identify identical values, storing them in a third level value map.\n   */\n  #inner: IndexMap<TKey, TValue, TPrefix>\n  #consolidatedMultiplicity: Map<TKey, number> = new Map() // sum of multiplicities per key\n\n  constructor() {\n    this.#inner = new Map()\n  }\n\n  /**\n   * Create an Index from multiple MultiSet messages.\n   * @param messages - Array of MultiSet messages to build the index from.\n   * @returns A new Index containing all the data from the messages.\n   */\n  static fromMultiSets<K, V>(messages: Array<MultiSet<[K, V]>>): Index<K, V> {\n    const index = new Index<K, V>()\n\n    for (const message of messages) {\n      for (const [item, multiplicity] of message.getInner()) {\n        const [key, value] = item\n        index.addValue(key, [value, multiplicity])\n      }\n    }\n\n    return index\n  }\n\n  /**\n   * This method returns a string representation of the index.\n   * @param indent - Whether to indent the string representation.\n   * @returns A string representation of the index.\n   */\n  toString(indent = false): string {\n    return `Index(${JSON.stringify(\n      [...this.entries()],\n      undefined,\n      indent ? 2 : undefined,\n    )})`\n  }\n\n  /**\n   * The size of the index.\n   */\n  get size(): number {\n    return this.#inner.size\n  }\n\n  /**\n   * This method checks if the index has a given key.\n   * @param key - The key to check.\n   * @returns True if the index has the key, false otherwise.\n   */\n  has(key: TKey): boolean {\n    return this.#inner.has(key)\n  }\n\n  /**\n   * Check if a key has presence (non-zero consolidated multiplicity).\n   * @param key - The key to check.\n   * @returns True if the key has non-zero consolidated multiplicity, false otherwise.\n   */\n  hasPresence(key: TKey): boolean {\n    return (this.#consolidatedMultiplicity.get(key) || 0) !== 0\n  }\n\n  /**\n   * Get the consolidated multiplicity (sum of multiplicities) for a key.\n   * @param key - The key to get the consolidated multiplicity for.\n   * @returns The consolidated multiplicity for the key.\n   */\n  getConsolidatedMultiplicity(key: TKey): number {\n    return this.#consolidatedMultiplicity.get(key) || 0\n  }\n\n  /**\n   * Get all keys that have presence (non-zero consolidated multiplicity).\n   * @returns An iterator of keys with non-zero consolidated multiplicity.\n   */\n  getPresenceKeys(): Iterable<TKey> {\n    return this.#consolidatedMultiplicity.keys()\n  }\n\n  /**\n   * This method returns all values for a given key.\n   * @param key - The key to get the values for.\n   * @returns An array of value tuples [value, multiplicity].\n   */\n  get(key: TKey): Array<[TValue, number]> {\n    return [...this.getIterator(key)]\n  }\n\n  /**\n   * This method returns an iterator over all values for a given key.\n   * @param key - The key to get the values for.\n   * @returns An iterator of value tuples [value, multiplicity].\n   */\n  *getIterator(key: TKey): Iterable<[TValue, number]> {\n    const mapOrSingleValue = this.#inner.get(key)\n    if (isSingleValue(mapOrSingleValue)) {\n      yield mapOrSingleValue\n    } else if (mapOrSingleValue === undefined) {\n      return\n    } else if (mapOrSingleValue instanceof ValueMap) {\n      // Direct ValueMap - all values have NO_PREFIX\n      for (const valueTuple of mapOrSingleValue.values()) {\n        yield valueTuple\n      }\n    } else {\n      // PrefixMap - iterate through all prefixes\n      for (const singleValueOrValueMap of mapOrSingleValue.values()) {\n        if (isSingleValue(singleValueOrValueMap)) {\n          yield singleValueOrValueMap\n        } else {\n          for (const valueTuple of singleValueOrValueMap.values()) {\n            yield valueTuple\n          }\n        }\n      }\n    }\n  }\n\n  /**\n   * This returns an iterator that iterates over all key-value pairs.\n   * @returns An iterable of all key-value pairs (and their multiplicities) in the index.\n   */\n  *entries(): Iterable<[TKey, [TValue, number]]> {\n    for (const key of this.#inner.keys()) {\n      for (const valueTuple of this.getIterator(key)) {\n        yield [key, valueTuple]\n      }\n    }\n  }\n\n  /**\n   * This method only iterates over the keys and not over the values.\n   * Hence, it is more efficient than the `#entries` method.\n   * It returns an iterator that you can use if you need to iterate over the values for a given key.\n   * @returns An iterator of all *keys* in the index and their corresponding value iterator.\n   */\n  *entriesIterators(): Iterable<[TKey, Iterable<[TValue, number]>]> {\n    for (const key of this.#inner.keys()) {\n      yield [key, this.getIterator(key)]\n    }\n  }\n\n  /**\n   * This method adds a value to the index.\n   * @param key - The key to add the value to.\n   * @param valueTuple - The value tuple [value, multiplicity] to add to the index.\n   */\n  addValue(key: TKey, valueTuple: SingleValue<TValue>) {\n    const [value, multiplicity] = valueTuple\n    // If the multiplicity is 0, do nothing\n    if (multiplicity === 0) return\n\n    // Update consolidated multiplicity tracking\n    const newConsolidatedMultiplicity =\n      (this.#consolidatedMultiplicity.get(key) || 0) + multiplicity\n    if (newConsolidatedMultiplicity === 0) {\n      this.#consolidatedMultiplicity.delete(key)\n    } else {\n      this.#consolidatedMultiplicity.set(key, newConsolidatedMultiplicity)\n    }\n\n    const mapOrSingleValue = this.#inner.get(key)\n\n    if (mapOrSingleValue === undefined) {\n      // First value for this key\n      this.#inner.set(key, valueTuple)\n      return\n    }\n\n    if (isSingleValue(mapOrSingleValue)) {\n      // Handle transition from single value to map\n      this.#handleSingleValueTransition(\n        key,\n        mapOrSingleValue,\n        value,\n        multiplicity,\n      )\n      return\n    }\n\n    if (mapOrSingleValue instanceof ValueMap) {\n      // Handle existing ValueMap\n      const prefix = getPrefix<TValue, TPrefix>(value)\n      if (prefix !== NO_PREFIX) {\n        // Convert ValueMap to PrefixMap since we have a prefixed value\n        const prefixMap = new PrefixMap<TValue, TPrefix>()\n        prefixMap.set(NO_PREFIX, mapOrSingleValue)\n        prefixMap.set(prefix, valueTuple)\n        this.#inner.set(key, prefixMap)\n      } else {\n        // Add to existing ValueMap\n        const isEmpty = mapOrSingleValue.addValue(value, multiplicity)\n        if (isEmpty) {\n          this.#inner.delete(key)\n        }\n      }\n    } else {\n      // Handle existing PrefixMap\n      const isEmpty = mapOrSingleValue.addValue(value, multiplicity)\n      if (isEmpty) {\n        this.#inner.delete(key)\n      }\n    }\n  }\n\n  /**\n   * Handle the transition from a single value to either a ValueMap or PrefixMap\n   */\n  #handleSingleValueTransition(\n    key: TKey,\n    currentSingleValue: SingleValue<TValue>,\n    newValue: TValue,\n    multiplicity: number,\n  ) {\n    const [currentValue, currentMultiplicity] = currentSingleValue\n\n    // Check for exact same value (reference equality)\n    if (currentValue === newValue) {\n      const newMultiplicity = currentMultiplicity + multiplicity\n      if (newMultiplicity === 0) {\n        this.#inner.delete(key)\n      } else {\n        this.#inner.set(key, [newValue, newMultiplicity])\n      }\n      return\n    }\n\n    // Get prefixes for both values\n    const newPrefix = getPrefix<TValue, TPrefix>(newValue)\n    const currentPrefix = getPrefix<TValue, TPrefix>(currentValue)\n\n    // Check if they're the same value by prefix/suffix comparison\n    if (\n      currentPrefix === newPrefix &&\n      (currentValue === newValue || hash(currentValue) === hash(newValue))\n    ) {\n      const newMultiplicity = currentMultiplicity + multiplicity\n      if (newMultiplicity === 0) {\n        this.#inner.delete(key)\n      } else {\n        this.#inner.set(key, [newValue, newMultiplicity])\n      }\n      return\n    }\n\n    // Different values - choose appropriate map type\n    if (currentPrefix === NO_PREFIX && newPrefix === NO_PREFIX) {\n      // Both have NO_PREFIX, use ValueMap directly\n      const valueMap = new ValueMap<TValue>()\n      valueMap.set(hash(currentValue), currentSingleValue)\n      valueMap.set(hash(newValue), [newValue, multiplicity])\n      this.#inner.set(key, valueMap)\n    } else {\n      // At least one has a prefix, use PrefixMap\n      const prefixMap = new PrefixMap<TValue, TPrefix>()\n\n      if (currentPrefix === newPrefix) {\n        // Same prefix, different suffixes - need ValueMap within PrefixMap\n        const valueMap = new ValueMap<TValue>()\n        valueMap.set(hash(currentValue), currentSingleValue)\n        valueMap.set(hash(newValue), [newValue, multiplicity])\n        prefixMap.set(currentPrefix, valueMap)\n      } else {\n        // Different prefixes - store as separate single values\n        prefixMap.set(currentPrefix, currentSingleValue)\n        prefixMap.set(newPrefix, [newValue, multiplicity])\n      }\n\n      this.#inner.set(key, prefixMap)\n    }\n  }\n\n  /**\n   * This method appends another index to the current index.\n   * @param other - The index to append to the current index.\n   */\n  append(other: Index<TKey, TValue>): void {\n    for (const [key, value] of other.entries()) {\n      this.addValue(key, value)\n    }\n  }\n\n  /**\n   * This method joins two indexes.\n   * @param other - The index to join with the current index.\n   * @returns A multiset of the joined values.\n   */\n  join<TValue2>(\n    other: Index<TKey, TValue2>,\n  ): MultiSet<[TKey, [TValue, TValue2]]> {\n    const result: Array<[[TKey, [TValue, TValue2]], number]> = []\n    // We want to iterate over the smaller of the two indexes to reduce the\n    // number of operations we need to do.\n    if (this.size <= other.size) {\n      for (const [key, valueIt] of this.entriesIterators()) {\n        if (!other.has(key)) continue\n        const otherValues = other.get(key)\n        for (const [val1, mul1] of valueIt) {\n          for (const [val2, mul2] of otherValues) {\n            if (mul1 !== 0 && mul2 !== 0) {\n              result.push([[key, [val1, val2]], mul1 * mul2])\n            }\n          }\n        }\n      }\n    } else {\n      for (const [key, otherValueIt] of other.entriesIterators()) {\n        if (!this.has(key)) continue\n        const values = this.get(key)\n        for (const [val2, mul2] of otherValueIt) {\n          for (const [val1, mul1] of values) {\n            if (mul1 !== 0 && mul2 !== 0) {\n              result.push([[key, [val1, val2]], mul1 * mul2])\n            }\n          }\n        }\n      }\n    }\n\n    return new MultiSet(result)\n  }\n}\n\n/**\n * This function extracts the prefix from a value.\n * @param value - The value to extract the prefix from.\n * @returns The prefix and the suffix.\n */\nfunction getPrefix<TValue, TPrefix>(value: TValue): TPrefix | NO_PREFIX {\n  // If the value is an array and the first element is a string or number, then the\n  // first element is the prefix. This is used to distinguish between values without\n  // the need for hashing unless there are multiple values for the same prefix.\n  if (\n    Array.isArray(value) &&\n    (typeof value[0] === `string` ||\n      typeof value[0] === `number` ||\n      typeof value[0] === `bigint`)\n  ) {\n    return value[0] as TPrefix\n  }\n  return NO_PREFIX\n}\n\n/**\n * This function checks if a value is a single value.\n * @param value - The value to check.\n * @returns True if the value is a single value, false otherwise.\n */\nfunction isSingleValue<TValue>(\n  value: SingleValue<TValue> | unknown,\n): value is SingleValue<TValue> {\n  return 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