Package org.apache.drill.exec.store.ischema

Interface FilterEvaluator

All Known Implementing Classes:
FilterEvaluator.InfoSchemaFilterEvaluator, FilterEvaluator.NoFilterEvaluator
public interface FilterEvaluator
Evaluates information schema for the given condition. Evaluation can be done with or without filter.

  • Nested Class Summary

    Nested Classes
    Modifier and Type
    Interface
    Description
    static class 
    FilterEvaluator.InfoSchemaFilterEvaluator
    Evaluates necessity to visit certain type of information_schema data using provided filter.
    static class 
    FilterEvaluator.NoFilterEvaluator
    Evaluates necessity to visit certain type of information_schema data based on given schema type.

  • Method Summary

    Modifier and Type
    Method
    Description
    boolean
    shouldPruneSchema(String schemaName)
    Prune the given schema.
    boolean
    shouldVisitCatalog()
    Visit the catalog.
    boolean
    shouldVisitColumn(String schemaName, String tableName, String columnName)
    Visit the columns in the given schema and table.
    boolean
    shouldVisitFiles(String schemaName, org.apache.calcite.schema.SchemaPlus schema)
    Visit the files in the given schema.
    boolean
    shouldVisitSchema(String schemaName, org.apache.calcite.schema.SchemaPlus schema)
    Visit the given schema.
    boolean
    shouldVisitTable(String schemaName, String tableName, org.apache.calcite.schema.Schema.TableType tableType)
    Visit the tables in the given schema.

  • Method Details

    • shouldVisitCatalog

      boolean shouldVisitCatalog()
      Visit the catalog. Drill has only one catalog.
      Returns:
      whether to continue exploring the contents of the catalog or not. Contents are schema/schema tree.

    • shouldPruneSchema

      boolean shouldPruneSchema(String schemaName)
      Prune the given schema.
      Parameters:
      schemaName - name of the schema
      schema - schema object
      Returns:
      whether to prune this schema and all its descendants from the search tree.

    • shouldVisitSchema

      boolean shouldVisitSchema(String schemaName, org.apache.calcite.schema.SchemaPlus schema)
      Visit the given schema.
      Parameters:
      schemaName - name of the schema
      schema - schema object
      Returns:
      whether to continue exploring the contents of the schema or not. Contents are tables within the schema.

    • shouldVisitTable

      boolean shouldVisitTable(String schemaName, String tableName, org.apache.calcite.schema.Schema.TableType tableType)
      Visit the tables in the given schema.
      Parameters:
      schemaName - name of the schema
      tableName - name of the table
      tableType - type of the table
      Returns:
      whether to continue exploring the contents of the table or not. Contents are tables attributes and columns.

    • shouldVisitColumn

      boolean shouldVisitColumn(String schemaName, String tableName, String columnName)
      Visit the columns in the given schema and table.
      Parameters:
      schemaName - name of the schema
      tableName - name of the table
      columnName - type of the table
      Returns:
      whether to continue exploring the contents of the column or not. Contents are columns attributes.

    • shouldVisitFiles

      boolean shouldVisitFiles(String schemaName, org.apache.calcite.schema.SchemaPlus schema)
      Visit the files in the given schema.
      Parameters:
      schemaName - name of the schema
      schema - schema object
      Returns:
      whether to continue exploring the files in the schema