@tanstack/db/dist/cjs/query/select.cjs.map

A reactive client store for building super fast apps on sync

{"version":3,"file":"select.cjs","sources":["../../../src/query/select.ts"],"sourcesContent":["import { map } from \"@electric-sql/d2mini\"\nimport {\n  evaluateOperandOnNamespacedRow,\n  extractValueFromNamespacedRow,\n} from \"./extractors\"\nimport type { ConditionOperand, Query, SelectCallback } from \"./schema\"\nimport type { KeyedStream, NamespacedAndKeyedStream } from \"../types\"\n\nexport function processSelect(\n  pipeline: NamespacedAndKeyedStream,\n  query: Query,\n  mainTableAlias: string,\n  inputs: Record<string, KeyedStream>\n): KeyedStream {\n  return pipeline.pipe(\n    map(([key, namespacedRow]) => {\n      const result: Record<string, unknown> = {}\n\n      // Check if this is a grouped result (has no nested table structure)\n      // If it's a grouped result, we need to handle it differently\n      const isGroupedResult =\n        query.groupBy &&\n        Object.keys(namespacedRow).some(\n          (namespaceKey) =>\n            !Object.keys(inputs).includes(namespaceKey) &&\n            typeof namespacedRow[namespaceKey] !== `object`\n        )\n\n      if (!query.select) {\n        throw new Error(`Cannot process missing SELECT clause`)\n      }\n\n      for (const item of query.select) {\n        // Handle callback functions\n        if (typeof item === `function`) {\n          const callback = item as SelectCallback\n          const callbackResult = callback(namespacedRow)\n\n          // If the callback returns an object, merge its properties into the result\n          if (\n            callbackResult &&\n            typeof callbackResult === `object` &&\n            !Array.isArray(callbackResult)\n          ) {\n            Object.assign(result, callbackResult)\n          } else {\n            // If the callback returns a primitive value, we can't merge it\n            // This would need a specific key, but since we don't have one, we'll skip it\n            // In practice, select callbacks should return objects with keys\n            console.warn(\n              `SelectCallback returned a non-object value. SelectCallbacks should return objects with key-value pairs.`\n            )\n          }\n          continue\n        }\n\n        if (typeof item === `string`) {\n          // Handle wildcard select - all columns from all tables\n          if ((item as string) === `@*`) {\n            // For grouped results, just return the row as is\n            if (isGroupedResult) {\n              Object.assign(result, namespacedRow)\n            } else {\n              // Extract all columns from all tables\n              Object.assign(\n                result,\n                extractAllColumnsFromAllTables(namespacedRow)\n              )\n            }\n            continue\n          }\n\n          // Handle @table.* syntax - all columns from a specific table\n          if (\n            (item as string).startsWith(`@`) &&\n            (item as string).endsWith(`.*`)\n          ) {\n            const tableAlias = (item as string).slice(1, -2) // Remove the '@' and '.*' parts\n\n            // For grouped results, check if we have columns from this table\n            if (isGroupedResult) {\n              // In grouped results, we don't have the nested structure anymore\n              // So we can't extract by table. Just continue to the next item.\n              continue\n            } else {\n              // Extract all columns from the specified table\n              Object.assign(\n                result,\n                extractAllColumnsFromTable(namespacedRow, tableAlias)\n              )\n            }\n            continue\n          }\n\n          // Handle simple column references like \"@table.column\" or \"@column\"\n          if ((item as string).startsWith(`@`)) {\n            const columnRef = (item as string).substring(1)\n            const alias = columnRef\n\n            // For grouped results, check if the column is directly in the row first\n            if (isGroupedResult && columnRef in namespacedRow) {\n              result[alias] = namespacedRow[columnRef]\n            } else {\n              // Extract the value from the nested structure\n              result[alias] = extractValueFromNamespacedRow(\n                namespacedRow,\n                columnRef,\n                mainTableAlias,\n                undefined\n              )\n            }\n\n            // If the alias contains a dot (table.column),\n            // use just the column part as the field name\n            if (alias.includes(`.`)) {\n              const columnName = alias.split(`.`)[1]\n              result[columnName!] = result[alias]\n              delete result[alias]\n            }\n          }\n        } else {\n          // Handle aliased columns like { alias: \"@column_name\" }\n          for (const [alias, expr] of Object.entries(item)) {\n            if (typeof expr === `string` && (expr as string).startsWith(`@`)) {\n              const columnRef = (expr as string).substring(1)\n\n              // For grouped results, check if the column is directly in the row first\n              if (isGroupedResult && columnRef in namespacedRow) {\n                result[alias] = namespacedRow[columnRef]\n              } else {\n                // Extract the value from the nested structure\n                result[alias] = extractValueFromNamespacedRow(\n                  namespacedRow,\n                  columnRef,\n                  mainTableAlias,\n                  undefined\n                )\n              }\n            } else if (typeof expr === `object`) {\n              // For grouped results, the aggregate results are already in the row\n              if (isGroupedResult && alias in namespacedRow) {\n                result[alias] = namespacedRow[alias]\n              } else if ((expr as { ORDER_INDEX: unknown }).ORDER_INDEX) {\n                result[alias] = namespacedRow[mainTableAlias]![alias]\n              } else {\n                // This might be a function call\n                result[alias] = evaluateOperandOnNamespacedRow(\n                  namespacedRow,\n                  expr as ConditionOperand,\n                  mainTableAlias,\n                  undefined\n                )\n              }\n            }\n          }\n        }\n      }\n\n      return [key, result] as [string, typeof result]\n    })\n  )\n}\n\n// Helper function to extract all columns from all tables in a nested row\nfunction extractAllColumnsFromAllTables(\n  namespacedRow: Record<string, unknown>\n): Record<string, unknown> {\n  const result: Record<string, unknown> = {}\n\n  // Process each table in the nested row\n  for (const [tableAlias, tableData] of Object.entries(namespacedRow)) {\n    if (tableData && typeof tableData === `object`) {\n      // Add all columns from this table to the result\n      // If there are column name conflicts, the last table's columns will overwrite previous ones\n      Object.assign(\n        result,\n        extractAllColumnsFromTable(namespacedRow, tableAlias)\n      )\n    }\n  }\n\n  return result\n}\n\n// Helper function to extract all columns from a table in a nested row\nfunction extractAllColumnsFromTable(\n  namespacedRow: Record<string, unknown>,\n  tableAlias: string\n): Record<string, unknown> {\n  const result: Record<string, unknown> = {}\n\n  // Get the table data\n  const tableData = namespacedRow[tableAlias] as\n    | Record<string, unknown>\n    | null\n    | undefined\n\n  if (!tableData || typeof tableData !== `object`) {\n    return result\n  }\n\n  // Add all columns from the table to the result\n  for (const [columnName, value] of Object.entries(tableData)) {\n    result[columnName] = value\n  }\n\n  return 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