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import { is } from 'drizzle-orm/entity'
import { SQL, type SQLChunk, type SQLWrapper, sql as yql } from 'drizzle-orm/sql/sql'
import { Subquery } from 'drizzle-orm/subquery'
import { Table } from 'drizzle-orm/table'
import { type YdbSelectedFieldsOrdered, orderSelectedFields } from '../ydb-core/result-mapping.js'
import type { YdbJoinConfig, YdbSelectConfig, YdbSetOperatorConfig } from './dialect.types.js'
import {
type YdbFlattenConfig,
type YdbSampleConfig,
type YdbWindowClause,
matchRecognize as buildMatchRecognizeClause,
renderUniqueDistinctHints,
} from '../ydb-core/query-builders/select-syntax.js'
function qualifyIdentifier(tableAlias: string, columnName: string): SQL {
return yql`${yql.identifier(tableAlias)}.${yql.identifier(columnName)}`
}
function yqlBindingName(alias: string): string {
Iif (!/^[A-Za-z_][A-Za-z0-9_]*$/u.test(alias)) {
throw new Error(`YDB CTE alias "${alias}" cannot be used as a YQL binding name`)
}
return `$${alias}`
}
function findSelectionAlias(
value: unknown,
fields: YdbSelectedFieldsOrdered,
selectionAliases: string[]
): string | undefined {
let foundIndex = fields.findIndex(({ path, field }) => {
if (field === value) {
return true
}
Iif (is(value, SQL.Aliased)) {
if (is(field, SQL.Aliased) && field.fieldAlias === value.fieldAlias) {
return true
}
return path[path.length - 1] === value.fieldAlias
}
return false
})
return foundIndex >= 0 ? selectionAliases[foundIndex] : undefined
}
function mapChunkToSelectionAlias(
chunk: SQLChunk,
fields: YdbSelectedFieldsOrdered,
selectionAliases: string[],
context: string
): SQLChunk {
Iif (is(chunk, SQL)) {
return new SQL(
chunk.queryChunks.map((value) =>
mapChunkToSelectionAlias(value, fields, selectionAliases, context)
)
)
}
if (is(chunk, Column) || is(chunk, SQL.Aliased)) {
let alias = findSelectionAlias(chunk, fields, selectionAliases)
Iif (!alias) {
throw new Error(`YDB ${context} can only reference selected fields`)
}
return yql.identifier(alias)
}
return chunk
}
export function getSelectionAliases(fields: YdbSelectedFieldsOrdered): string[] {
return fields.map((_, index) => `__ydb_f${index}`)
}
export function mapExpressionsToSelectionAliases(
expressions: SQLWrapper[],
fields: YdbSelectedFieldsOrdered,
selectionAliases: string[],
context: string
): SQLWrapper[] {
return expressions.map((expression) => {
if (is(expression, Column) || is(expression, SQL.Aliased)) {
let alias = findSelectionAlias(expression, fields, selectionAliases)
if (!alias) {
throw new Error(`YDB ${context} can only reference selected fields`)
}
return yql.identifier(alias)
}
Eif (is(expression, SQL)) {
return new SQL(
expression.queryChunks.map((chunk) =>
mapChunkToSelectionAlias(chunk, fields, selectionAliases, context)
)
)
}
return expression
})
}
export function buildSelection(fields: YdbSelectedFieldsOrdered, aliases?: string[]): SQL {
Iif (fields.length === 0) {
return yql.raw('*')
}
let selection = fields.map(({ field }, index) => {
let alias = aliases?.[index]
Iif (is(field, SQL.Aliased) && (field as any).isSelectionField) {
let base = yql.identifier(field.fieldAlias)
return alias ? yql`${base} as ${yql.identifier(alias)}` : base
}
if (is(field, SQL.Aliased)) {
return alias
? yql`${field.sql} as ${yql.identifier(alias)}`
: yql`${field.sql} as ${yql.identifier(field.fieldAlias)}`
}
Eif (is(field, Column) || is(field, SQL) || is(field, Subquery)) {
return alias
? yql`${field as SQLWrapper} as ${yql.identifier(alias)}`
: yql`${field as SQLWrapper}`
}
return alias
? yql`${field as SQLWrapper} as ${yql.identifier(alias)}`
: yql`${field as SQLWrapper}`
})
return yql.join(selection, yql`, `)
}
function buildSelectionWithout(without: SQLWrapper[]): SQL {
return yql`* WITHOUT ${yql.join(
without.map((value) => yql`${value}`),
yql`, `
)}`
}
export function buildReturningSelection(fields: YdbSelectedFieldsOrdered): SQL {
Iif (fields.length === 0) {
return yql.raw('*')
}
let selection = fields.map(({ field }) => {
Iif (is(field, SQL.Aliased) && (field as any).isSelectionField) {
return yql.identifier(field.fieldAlias)
}
if (is(field, SQL.Aliased)) {
return yql`${field.sql} as ${yql.identifier(field.fieldAlias)}`
}
Eif (is(field, Column)) {
return yql.identifier(field.name)
}
return yql`${field as SQLWrapper}`
})
return yql.join(selection, yql`, `)
}
export function buildFromTable(table: unknown): SQLWrapper {
if (is(table, Subquery)) {
let alias = table._.alias
if (table._.isWith) {
return yql`${yql.raw(yqlBindingName(alias))} as ${yql.identifier(alias)}`
}
return yql`(${table._.sql}) as ${yql.identifier(alias)}`
}
if (is(table, Table) && (table as any)[(Table as any).Symbol.IsAlias]) {
return yql`${yql.identifier((table as any)[(Table as any).Symbol.OriginalName])} ${yql.identifier((table as any)[(Table as any).Symbol.Name])}`
}
return table as SQLWrapper
}
export function buildJoins(joins: YdbJoinConfig[] | undefined): SQL | undefined {
if (!joins || joins.length === 0) {
return undefined
}
let joinsSql = joins.map((join) => {
let onSql = join.on ? yql` on ${join.on}` : undefined
let joinKeyword = yql.raw(`${join.joinType} join`)
Iif (is(join.table, Table) && (join.table as any)[(Table as any).Symbol.IsAlias]) {
return yql`${joinKeyword} ${yql.identifier((join.table as any)[(Table as any).Symbol.OriginalName])} ${yql.identifier((join.table as any)[(Table as any).Symbol.Name])}${onSql}`
}
return yql`${joinKeyword} ${join.table as SQLWrapper}${onSql}`
})
return yql` ${yql.join(joinsSql, yql` `)}`
}
export function buildOrderBy(orderBy: SQLWrapper[] | undefined): SQL | undefined {
if (!orderBy || orderBy.length === 0) {
return undefined
}
return yql` order by ${yql.join(
orderBy.map((value) => yql`${value}`),
yql`, `
)}`
}
export function buildAssumeOrderBy(assumeOrderBy: SQLWrapper[] | undefined): SQL | undefined {
if (!assumeOrderBy || assumeOrderBy.length === 0) {
return undefined
}
return yql` assume order by ${yql.join(
assumeOrderBy.map((value) => yql`${value}`),
yql`, `
)}`
}
export function buildLimit(limit: number | undefined): SQL | undefined {
return limit !== undefined ? yql` limit ${limit}` : undefined
}
export function buildOffset(offset: number | undefined): SQL | undefined {
return offset !== undefined ? yql` offset ${offset}` : undefined
}
function buildFlatten(flatten: YdbFlattenConfig | undefined): SQL | undefined {
if (!flatten) {
return undefined
}
Iif (flatten.mode === 'columns') {
return yql` flatten columns`
}
Iif (!flatten.expressions || flatten.expressions.length === 0) {
throw new Error('YDB flatten requires at least one expression')
}
return yql` flatten ${yql.raw(flatten.mode)} ${yql.join(
flatten.expressions.map((value) => yql`${value}`),
yql`, `
)}`
}
function buildSample(sample: YdbSampleConfig | undefined): SQL | undefined {
if (!sample) {
return undefined
}
if (sample.kind === 'sample') {
return yql` sample ${typeof sample.ratio === 'number' ? yql`${sample.ratio}` : sample.ratio}`
}
let repeatable =
sample.repeatable === undefined
? undefined
: yql` repeatable(${typeof sample.repeatable === 'number' ? yql`${sample.repeatable}` : sample.repeatable})`
return yql` tablesample ${yql.raw(sample.method)}(${typeof sample.size === 'number' ? yql`${sample.size}` : sample.size})${repeatable}`
}
function buildMatchRecognize(matchRecognize: YdbSelectConfig['matchRecognize']): SQL | undefined {
if (!matchRecognize) {
return undefined
}
return yql` match_recognize ${buildMatchRecognizeClause(matchRecognize)}`
}
function buildWindows(windows: YdbWindowClause[] | undefined): SQL | undefined {
if (!windows || windows.length === 0) {
return undefined
}
return yql` window ${yql.join(
windows.map((window) => yql`${yql.identifier(window.name)} AS ${window.definition}`),
yql`, `
)}`
}
function buildSimpleSelectQuery(
config: Omit<YdbSelectConfig, 'table' | 'fields' | 'fieldsFlat' | 'setOperators'> & {
table?: unknown
fieldsFlat: YdbSelectedFieldsOrdered
extraSelections?: SQL[]
}
): SQL {
let selection =
config.without && config.without.length > 0
? buildSelectionWithout(config.without)
: buildSelection(config.fieldsFlat, config.selectionAliases)
let allSelections =
config.extraSelections && config.extraSelections.length > 0
? yql`${selection}, ${yql.join(config.extraSelections, yql`, `)}`
: selection
let joinsSql = buildJoins(config.joins)
let whereSql = config.where ? yql` where ${config.where}` : undefined
let groupBySql =
config.groupBy && config.groupBy.length > 0
? yql` ${yql.raw(config.groupByCompact ? 'group compact by' : 'group by')} ${yql.join(
config.groupBy.map((value) => yql`${value}`),
yql`, `
)}`
: undefined
let havingSql = config.having ? yql` having ${config.having}` : undefined
let windowSql = buildWindows(config.windows)
let orderBySql = buildOrderBy(config.orderBy)
let assumeOrderBySql = buildAssumeOrderBy(config.assumeOrderBy)
let limitSql = buildLimit(config.limit)
let offsetSql = buildOffset(config.offset)
let intoResultSql = config.intoResult
? yql` into result ${yql.identifier(config.intoResult)}`
: undefined
let uniqueDistinctSql =
config.uniqueDistinctHints && config.uniqueDistinctHints.length > 0
? yql` ${renderUniqueDistinctHints(config.uniqueDistinctHints)}`
: undefined
let distinctSql = config.distinct ? yql` distinct` : undefined
let sampleSql = buildSample(config.sample)
let matchRecognizeSql = buildMatchRecognize(config.matchRecognize)
let flattenSql = buildFlatten(config.flatten)
let fromSql =
config.table === undefined
? undefined
: yql` from ${buildFromTable(config.table)}${sampleSql}${matchRecognizeSql}${flattenSql}`
return yql`select${uniqueDistinctSql}${distinctSql} ${allSelections}${fromSql}${joinsSql}${whereSql}${groupBySql}${havingSql}${windowSql}${orderBySql}${assumeOrderBySql}${limitSql}${offsetSql}${intoResultSql}`
}
function buildDistinctOnQuery(
config: YdbSelectConfig,
fieldsFlat: YdbSelectedFieldsOrdered,
selectionAliases: string[]
): SQL {
Iif (!config.distinctOn || config.distinctOn.length === 0) {
throw new Error('YDB distinctOn() requires at least one expression')
}
let distinctAlias = '__ydb_distinct_on'
let rowNumberAlias = '__ydb_row_number'
let rowNumberSelection = yql`row_number() over (
partition by ${yql.join(
config.distinctOn.map((value) => yql`${value}`),
yql`, `
)}
${buildOrderBy(config.orderBy)}
) as ${yql.identifier(rowNumberAlias)}`
let innerQuery = buildSimpleSelectQuery({
table: config.table,
fieldsFlat,
joins: config.joins,
where: config.where,
groupBy: config.groupBy,
groupByCompact: config.groupByCompact,
having: config.having,
windows: config.windows,
distinct: false,
without: config.without,
flatten: config.flatten,
sample: config.sample,
matchRecognize: config.matchRecognize,
uniqueDistinctHints: config.uniqueDistinctHints,
selectionAliases,
extraSelections: [rowNumberSelection],
})
let outerOrderBy =
config.orderBy && config.orderBy.length > 0
? mapExpressionsToSelectionAliases(
config.orderBy,
fieldsFlat,
selectionAliases,
'distinctOn() orderBy()'
)
: undefined
let selection = yql.join(
selectionAliases.map((alias) => yql.identifier(alias)),
yql`, `
)
let rowNumberFilter = yql`${qualifyIdentifier(distinctAlias, rowNumberAlias)} = 1`
let intoResultSql = config.intoResult
? yql` into result ${yql.identifier(config.intoResult)}`
: undefined
return yql`select ${selection} from (${innerQuery}) as ${yql.identifier(distinctAlias)} where ${rowNumberFilter}${buildOrderBy(outerOrderBy)}${buildLimit(config.limit)}${buildOffset(config.offset)}${intoResultSql}`
}
function buildEmulatedSetOperationQuery(
type: 'intersect' | 'except',
leftSelect: SQL,
rightSelect: SQL,
selectionAliases: string[],
orderBy: SQLWrapper[] | undefined,
limit: number | undefined,
offset: number | undefined
): SQL {
let leftAlias = '__ydb_left'
let rightAlias = '__ydb_right'
let matchAlias = '__ydb_match'
let rightInputAlias = '__ydb_right_input'
let rightSelection = yql.join(
selectionAliases.map(
(alias) => yql`${qualifyIdentifier(rightInputAlias, alias)} as ${yql.identifier(alias)}`
),
yql`, `
)
let rightComparable = yql`select ${rightSelection}, 1 as ${yql.identifier(matchAlias)} from (${rightSelect}) as ${yql.identifier(rightInputAlias)}`
let joinConditions = selectionAliases.map((alias) => {
let leftValue = qualifyIdentifier(leftAlias, alias)
let rightValue = qualifyIdentifier(rightAlias, alias)
return yql`${leftValue} = ${rightValue}`
})
let onSql = yql.join(joinConditions, yql` and `)
let selection = yql.join(
selectionAliases.map(
(alias) => yql`${qualifyIdentifier(leftAlias, alias)} as ${yql.identifier(alias)}`
),
yql`, `
)
let joinSql =
type === 'intersect'
? yql`inner join (${rightComparable}) as ${yql.identifier(rightAlias)} on ${onSql}`
: yql`left join (${rightComparable}) as ${yql.identifier(rightAlias)} on ${onSql}`
let whereSql =
type === 'except'
? yql` where ${qualifyIdentifier(rightAlias, matchAlias)} is null`
: undefined
return yql`select distinct ${selection} from (${leftSelect}) as ${yql.identifier(leftAlias)} ${joinSql}${whereSql}${buildOrderBy(orderBy)}${buildLimit(limit)}${buildOffset(offset)}`
}
export function buildSetOperationQuery(
leftSelect: SQL,
fields: YdbSelectedFieldsOrdered,
selectionAliases: string[],
setOperator: YdbSetOperatorConfig
): SQL {
let rightSelect = setOperator.rightSelect.getSQL(selectionAliases)
let mappedOrderBy =
setOperator.orderBy && setOperator.orderBy.length > 0
? mapExpressionsToSelectionAliases(
setOperator.orderBy,
fields,
selectionAliases,
`${setOperator.type}() orderBy()`
)
: undefined
if (setOperator.type === 'union') {
let operator = yql.raw(`union${setOperator.isAll ? ' all' : ''}`)
return yql`${leftSelect} ${operator} ${rightSelect}${buildOrderBy(mappedOrderBy)}${buildLimit(setOperator.limit)}${buildOffset(setOperator.offset)}`
}
return buildEmulatedSetOperationQuery(
setOperator.type,
leftSelect,
rightSelect,
selectionAliases,
mappedOrderBy,
setOperator.limit,
setOperator.offset
)
}
export function buildSetOperations(
leftSelect: SQL,
fields: YdbSelectedFieldsOrdered,
selectionAliases: string[],
setOperators: YdbSetOperatorConfig[]
): SQL {
return setOperators.reduce(
(current, setOperator) =>
buildSetOperationQuery(current, fields, selectionAliases, setOperator),
leftSelect
)
}
export function buildSelectQuery(config: YdbSelectConfig): SQL {
let fieldsFlat = config.fieldsFlat ?? orderSelectedFields(config.fields)
let selectionAliases = config.selectionAliases
let baseQuery =
config.distinctOn && config.distinctOn.length > 0
? buildDistinctOnQuery(
config,
fieldsFlat,
selectionAliases ?? getSelectionAliases(fieldsFlat)
)
: buildSimpleSelectQuery({
table: config.table,
fieldsFlat,
joins: config.joins,
where: config.where,
groupBy: config.groupBy,
groupByCompact: config.groupByCompact,
having: config.having,
windows: config.windows,
orderBy: config.orderBy,
assumeOrderBy: config.assumeOrderBy,
limit: config.limit,
offset: config.offset,
intoResult: config.intoResult,
without: config.without,
flatten: config.flatten,
sample: config.sample,
matchRecognize: config.matchRecognize,
uniqueDistinctHints: config.uniqueDistinctHints,
distinct: config.distinct,
selectionAliases,
})
if (config.setOperators.length === 0) {
return baseQuery
}
return buildSetOperations(
baseQuery,
fieldsFlat,
selectionAliases ?? getSelectionAliases(fieldsFlat),
config.setOperators
)
}
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