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export type YdbOrderDirection = 'asc' | 'desc'
export type YdbValuesPrimitive = string | number | boolean | bigint | null | Uint8Array | Date
export type YdbValuesRow =
| readonly YdbValuesPrimitive[]
| Readonly<Record<string, YdbValuesPrimitive>>
export interface YdbValuesOptions {
alias?: string | undefined
columns?: readonly string[] | undefined
}
export type YdbFlattenMode = 'by' | 'list by' | 'dict by' | 'optional by' | 'columns'
export interface YdbFlattenConfig {
mode: YdbFlattenMode
expressions?: SQLWrapper[] | undefined
}
export type YdbSampleConfig =
| { kind: 'sample'; ratio: number | SQLWrapper }
| {
kind: 'tablesample'
method: string
size: number | SQLWrapper
repeatable?: number | SQLWrapper | undefined
}
export interface YdbMatchRecognizeConfig {
partitionBy?: SQLWrapper[] | undefined
orderBy?: SQLWrapper[] | undefined
measures?: Readonly<Record<string, SQLWrapper>> | undefined
rowsPerMatch?: 'ONE ROW PER MATCH' | 'ALL ROWS PER MATCH' | undefined
afterMatchSkip?: string | undefined
pattern: string | SQLWrapper
define?: Readonly<Record<string, SQLWrapper>> | undefined
}
export interface YdbUniqueDistinctHint {
kind: 'unique' | 'distinct'
columns?: readonly string[] | undefined
}
export interface YdbWindowClause {
name: string
definition: SQLWrapper
}
export interface YdbWindowDefinitionConfig {
partitionBy?: readonly SQLWrapper[] | undefined
orderBy?: readonly SQLWrapper[] | undefined
frame?: string | SQLWrapper | undefined
}
export type YdbGroupingSet = readonly SQLWrapper[]
export type YdbKnnDistanceFunction = 'CosineDistance' | 'EuclideanDistance' | 'ManhattanDistance'
export type YdbKnnSimilarityFunction = 'CosineSimilarity' | 'InnerProductSimilarity'
function assertIdentifier(name: string, context: string): void {
Iif (!/^[A-Za-z_][A-Za-z0-9_]*$/u.test(name)) {
throw new Error(`YDB ${context} must be a simple identifier`)
}
}
function assertHintColumn(name: string): void {
assertIdentifier(name, 'UNIQUE DISTINCT hint column')
}
function renderBindingName(name: string): SQL {
let binding = name.startsWith('$') ? name : `$${name}`
Iif (!/^\$[A-Za-z_][A-Za-z0-9_]*$/u.test(binding)) {
throw new Error('YDB AS_TABLE binding must look like $name')
}
return yql.raw(binding)
}
function renderValue(value: YdbValuesPrimitive): SQL {
return value === null ? yql`NULL` : yql`${value}`
}
function normalizeRows(rows: readonly YdbValuesRow[]): {
rows: readonly SQL[]
columns?: string[]
} {
Iif (rows.length === 0) {
throw new Error('YDB VALUES requires at least one row')
}
if (Array.isArray(rows[0])) {
let expectedLength = (rows[0] as readonly unknown[]).length
Iif (expectedLength === 0) {
throw new Error('YDB VALUES rows require at least one value')
}
return {
rows: rows.map((row) => {
Iif (!Array.isArray(row) || row.length !== expectedLength) {
throw new Error('YDB VALUES array rows must have the same length')
}
return yql`(${yql.join(
row.map((value) => renderValue(value)),
yql`, `
)})`
}),
}
}
let columns = Object.keys(rows[0] as Record<string, YdbValuesPrimitive>)
Iif (columns.length === 0) {
throw new Error('YDB VALUES object rows require at least one key')
}
for (let column of columns) {
assertIdentifier(column, 'VALUES column')
}
return {
columns,
rows: rows.map((row) => {
Iif (Array.isArray(row)) {
throw new Error('YDB VALUES cannot mix object and array rows')
}
let keys = Object.keys(row)
Iif (
keys.length !== columns.length ||
keys.some((key, index) => key !== columns[index])
) {
throw new Error('YDB VALUES object rows must have identical key order')
}
let objectRow = row as Record<string, YdbValuesPrimitive>
return yql`(${yql.join(
columns.map((column) => renderValue(objectRow[column] ?? null)),
yql`, `
)})`
}),
}
}
function isMatchRecognizeConfig(
value: YdbMatchRecognizeConfig | SQLWrapper
): value is YdbMatchRecognizeConfig {
return typeof value === 'object' && value !== null && 'pattern' in value
}
function isWindowDefinitionConfig(
value: YdbWindowDefinitionConfig | SQLWrapper
): value is YdbWindowDefinitionConfig {
return (
typeof value === 'object' &&
value !== null &&
('partitionBy' in value || 'orderBy' in value || 'frame' in value)
)
}
function renderExpressionList(expressions: readonly SQLWrapper[]): SQL {
return yql.join(
expressions.map((value) => yql`${value}`),
yql`, `
)
}
function renderIntervalLiteral(value: string | SQLWrapper): SQLWrapper {
return typeof value === 'string' ? yql`${value}` : value
}
export function values(rows: readonly YdbValuesRow[]): SQL {
let normalized = normalizeRows(rows)
return yql`VALUES ${yql.join([...normalized.rows], yql`, `)}`
}
export function valuesTable(rows: readonly YdbValuesRow[], options: YdbValuesOptions = {}): SQL {
let normalized = normalizeRows(rows)
let alias = options.alias
let columns = options.columns ?? normalized.columns
let columnSql =
columns && columns.length > 0
? yql.raw(
`(${columns
.map((column) => {
assertIdentifier(column, 'VALUES column')
return `\`${column.replace(/`/g, '``')}\``
})
.join(', ')})`
)
: undefined
let source = yql`(${yql.raw('VALUES')} ${yql.join([...normalized.rows], yql`, `)})`
Iif (!alias) {
return source
}
assertIdentifier(alias, 'VALUES alias')
return columnSql
? yql`${source} as ${yql.identifier(alias)}${columnSql}`
: yql`${source} as ${yql.identifier(alias)}`
}
export function asTable(binding: string | SQLWrapper, alias?: string): SQL {
let source =
typeof binding === 'string'
? yql`AS_TABLE(${renderBindingName(binding)})`
: yql`AS_TABLE(${binding})`
if (!alias) {
return source
}
assertIdentifier(alias, 'AS_TABLE alias')
return yql`${source} as ${yql.identifier(alias)}`
}
export function matchRecognize(config: YdbMatchRecognizeConfig | SQLWrapper): SQL {
Iif (!isMatchRecognizeConfig(config)) {
return yql`${config}`
}
let partitionBy =
config.partitionBy && config.partitionBy.length > 0
? yql`PARTITION BY ${yql.join(
config.partitionBy.map((value) => yql`${value}`),
yql`, `
)} `
: undefined
let orderBy =
config.orderBy && config.orderBy.length > 0
? yql`ORDER BY ${yql.join(
config.orderBy.map((value) => yql`${value}`),
yql`, `
)} `
: undefined
let measures =
config.measures && Object.keys(config.measures).length > 0
? yql`MEASURES ${yql.join(
Object.entries(config.measures).map(([alias, expression]) => {
assertIdentifier(alias, 'MATCH_RECOGNIZE measure alias')
return yql`${expression} AS ${yql.identifier(alias)}`
}),
yql`, `
)} `
: undefined
let rowsPerMatch = config.rowsPerMatch ? yql.raw(`${config.rowsPerMatch} `) : undefined
let afterMatchSkip = config.afterMatchSkip
? yql.raw(`AFTER MATCH SKIP ${config.afterMatchSkip} `)
: undefined
let pattern = typeof config.pattern === 'string' ? yql.raw(config.pattern) : config.pattern
let define =
config.define && Object.keys(config.define).length > 0
? yql` DEFINE ${yql.join(
Object.entries(config.define).map(([name, expression]) => {
assertIdentifier(name, 'MATCH_RECOGNIZE variable')
return yql`${yql.raw(name)} AS ${expression}`
}),
yql`, `
)}`
: undefined
return yql`(${partitionBy}${orderBy}${measures}${rowsPerMatch}${afterMatchSkip}PATTERN ${pattern}${define})`
}
export function uniqueHint(...columns: string[]): YdbUniqueDistinctHint {
columns.forEach(assertHintColumn)
return { kind: 'unique', columns }
}
export function distinctHint(...columns: string[]): YdbUniqueDistinctHint {
columns.forEach(assertHintColumn)
return { kind: 'distinct', columns }
}
export function renderUniqueDistinctHints(hints: readonly YdbUniqueDistinctHint[]): SQL {
Iif (hints.length === 0) {
throw new Error('YDB UNIQUE DISTINCT hints require at least one hint')
}
let rendered = hints.map((hint) => {
let columns = hint.columns ?? []
columns.forEach(assertHintColumn)
return `${hint.kind}(${columns.join(' ')})`
})
return yql.raw(`/*+ ${rendered.join(' ')} */`)
}
export function windowDefinition(config: YdbWindowDefinitionConfig | SQLWrapper): SQL {
if (!isWindowDefinitionConfig(config)) {
return yql`${config}`
}
let parts: SQL[] = []
if (config.partitionBy && config.partitionBy.length > 0) {
parts.push(yql`PARTITION BY ${renderExpressionList(config.partitionBy)}`)
}
Eif (config.orderBy && config.orderBy.length > 0) {
parts.push(yql`ORDER BY ${renderExpressionList(config.orderBy)}`)
}
if (config.frame) {
parts.push(typeof config.frame === 'string' ? yql.raw(config.frame) : yql`${config.frame}`)
}
return yql`(${yql.join(parts, yql` `)})`
}
export function groupKey(expression: SQLWrapper, alias: string): SQL {
assertIdentifier(alias, 'GROUP BY alias')
return yql`${expression} AS ${yql.identifier(alias)}`
}
export function rollup(...expressions: SQLWrapper[]): SQL {
Iif (expressions.length === 0) {
throw new Error('YDB ROLLUP requires at least one expression')
}
return yql`ROLLUP(${renderExpressionList(expressions)})`
}
export function cube(...expressions: SQLWrapper[]): SQL {
Iif (expressions.length === 0) {
throw new Error('YDB CUBE requires at least one expression')
}
return yql`CUBE(${renderExpressionList(expressions)})`
}
export function groupingSets(...sets: [YdbGroupingSet, ...YdbGroupingSet[]]): SQL {
return yql`GROUPING SETS(${yql.join(
sets.map((set) => yql`(${renderExpressionList(set)})`),
yql`, `
)})`
}
export function grouping(...expressions: SQLWrapper[]): SQL {
Iif (expressions.length === 0) {
throw new Error('YDB GROUPING requires at least one expression')
}
return yql`GROUPING(${renderExpressionList(expressions)})`
}
export function sessionWindow(
orderExpression: SQLWrapper,
timeoutExpression: string | SQLWrapper
): SQL
export function sessionWindow(
orderExpression: SQLWrapper,
initLambda: SQLWrapper,
updateLambda: SQLWrapper,
calculateLambda: SQLWrapper
): SQL
export function sessionWindow(
orderExpression: SQLWrapper,
second: string | SQLWrapper,
updateLambda?: SQLWrapper,
calculateLambda?: SQLWrapper
): SQL {
Iif (updateLambda || calculateLambda) {
if (!updateLambda || !calculateLambda || typeof second === 'string') {
throw new Error(
'YDB SessionWindow extended form requires init, update, and calculate lambdas'
)
}
return yql`SessionWindow(${orderExpression}, ${second}, ${updateLambda}, ${calculateLambda})`
}
return yql`SessionWindow(${orderExpression}, ${renderIntervalLiteral(second)})`
}
export function sessionStart(): SQL {
return yql.raw('SessionStart()')
}
export function hop(
timeExtractor: SQLWrapper,
hopInterval: string | SQLWrapper,
windowInterval: string | SQLWrapper,
delay: string | SQLWrapper
): SQL {
return yql`HOP(${timeExtractor}, ${renderIntervalLiteral(hopInterval)}, ${renderIntervalLiteral(windowInterval)}, ${renderIntervalLiteral(delay)})`
}
export function hopStart(): SQL {
return yql.raw('HOP_START()')
}
export function hopEnd(): SQL {
return yql.raw('HOP_END()')
}
export function knnDistance(
fn: YdbKnnDistanceFunction,
vector: SQLWrapper,
target: SQLWrapper
): SQL {
return yql`${yql.raw(`Knn::${fn}`)}(${vector}, ${target})`
}
export function knnSimilarity(
fn: YdbKnnSimilarityFunction,
vector: SQLWrapper,
target: SQLWrapper
): SQL {
return yql`${yql.raw(`Knn::${fn}`)}(${vector}, ${target})`
}
export function knnCosineDistance(vector: SQLWrapper, target: SQLWrapper): SQL {
return knnDistance('CosineDistance', vector, target)
}
export function knnEuclideanDistance(vector: SQLWrapper, target: SQLWrapper): SQL {
return knnDistance('EuclideanDistance', vector, target)
}
export function knnManhattanDistance(vector: SQLWrapper, target: SQLWrapper): SQL {
return knnDistance('ManhattanDistance', vector, target)
}
export function knnCosineSimilarity(vector: SQLWrapper, target: SQLWrapper): SQL {
return knnSimilarity('CosineSimilarity', vector, target)
}
export function knnInnerProductSimilarity(vector: SQLWrapper, target: SQLWrapper): SQL {
return knnSimilarity('InnerProductSimilarity', vector, target)
}
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