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 and 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 and 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 Detail

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