[spark] Support nested col pruning #4269
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JingsongLi
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Are there some configuration to disable nested projection? I am concern about bugs in nested projection, at least, we should have option to disable it.
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yes, spark has a conf to enabled nestedSchemaPruning val NESTED_SCHEMA_PRUNING_ENABLED =
buildConf("spark.sql.optimizer.nestedSchemaPruning.enabled")
.internal()
.doc("Prune nested fields from a logical relation's output which are unnecessary in " +
"satisfying a query. This optimization allows columnar file format readers to avoid " +
"reading unnecessary nested column data. Currently Parquet and ORC are the " +
"data sources that implement this optimization.")
.version("2.4.1")
.booleanConf
.createWithDefault(true) |
JingsongLi
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| String fieldName = field.name(); | ||
| if (parquetGroup.containsField(fieldName)) { | ||
| Type type = parquetGroup.getType(fieldName); | ||
| if (type instanceof GroupType && field.type() instanceof RowType) { |
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Can Spark push down nested fields for array and map?
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Purpose
to #4209, Support nested col pruning, e.g.
will only obtain
course.gradefrom colume-storage-format (parquet, orc)Tests
API and Format
Documentation