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  • package root
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    root
  • package org
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    root
  • package apache
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    org
  • package spark
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    apache
  • package sql
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    spark
  • package delta
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    sql
  • package perf
    Definition Classes
    delta
  • trait OptimizeMetadataOnlyDeltaQuery extends LoggingShims

    Optimize COUNT, MIN and MAX expressions on Delta tables.

    Optimize COUNT, MIN and MAX expressions on Delta tables. This optimization is only applied when the following conditions are met: - The MIN/MAX columns are not nested and data type is supported by the optimization (ByteType, ShortType, IntegerType, LongType, FloatType, DoubleType, DateType). - All AddFiles in the Delta Log must have stats on columns used in MIN/MAX expressions, or the columns must be partitioned, in the latter case it uses partitionValues, a required field. - Table has no deletion vectors, or query has no MIN/MAX expressions. - COUNT has no DISTINCT. - Query has no filters. - Query has no GROUP BY. Example of valid query: SELECT COUNT(*), MIN(id), MAX(partition_col) FROM MyDeltaTable

    Definition Classes
    perf
  • DeltaColumnStat
  • LogStringContext
  • MetadataOptimizableAggregate

object MetadataOptimizableAggregate

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  12. def isSupportedDataType(dataType: DataType): Boolean

    Only data type that are stored in stats without any loss of precision are supported.

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  18. def unapply(plan: Aggregate): Option[TahoeLogFileIndex]
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