CatalogColumnStat¶

Creating Instance¶

CatalogColumnStat takes the following to be created:

• Distinct Count (number of distinct values)
• Minimum Value
• Maximum Value
• Null Count (number of null values)
• Average length of the values (for fixed-length types, this should be a constant)
• Maximum length of the values (for fixed-length types, this should be a constant)
• Histogram
• 2

CatalogColumnStat is created when:

• CatalogColumnStat is requested to fromMap
• ColumnStat is requested to toCatalogColumnStat

fromMap¶

fromMap(
  table: String,
  colName: String,
  map: Map[String, String]): Option[CatalogColumnStat]

fromMap creates a CatalogColumnStat using the given map (with the colName-prefixed keys).

fromMap is used when:

• HiveExternalCatalog is requested to statsFromProperties

toPlanStat¶

toPlanStat(
  colName: String,
  dataType: DataType): ColumnStat

toPlanStat converts this CatalogColumnStat to a ColumnStat.

toPlanStat is used when:

• CatalogStatistics is requested to toPlanStats