org.apache.drill.exec.store.ischema

Class InfoSchemaRecordGenerator<S>

java.lang.Object

org.apache.drill.exec.store.ischema.InfoSchemaRecordGenerator<S>

Direct Known Subclasses:

InfoSchemaRecordGenerator.Catalogs, InfoSchemaRecordGenerator.Columns, InfoSchemaRecordGenerator.Schemata, InfoSchemaRecordGenerator.Tables, InfoSchemaRecordGenerator.Views

public abstract class InfoSchemaRecordGenerator<S>
extends Object

Generates records for POJO RecordReader by scanning the given schema. At every level (catalog, schema, table, field), level specific object is visited and decision is taken to visit the contents of the object. Object here is catalog, schema, table or field.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	InfoSchemaRecordGenerator.Catalogs
static class	InfoSchemaRecordGenerator.Columns
static class	InfoSchemaRecordGenerator.Schemata
static class	InfoSchemaRecordGenerator.Tables
static class	InfoSchemaRecordGenerator.Views

Field Summary

Fields

Modifier and Type	Field and Description
protected InfoSchemaFilter	filter
protected OptionManager	optionManager

Constructor Summary

Constructors

Constructor and Description
InfoSchemaRecordGenerator(OptionManager optionManager)

Method Summary

Methods

Modifier and Type	Method and Description
abstract PojoRecordReader<S>	getRecordReader()
void	scanSchema(org.apache.calcite.schema.SchemaPlus root)
void	setInfoSchemaFilter(InfoSchemaFilter filter)
protected boolean	shouldVisitCatalog()
protected boolean	shouldVisitColumn(String schemaName, String tableName, String columnName)
protected boolean	shouldVisitSchema(String schemaName, org.apache.calcite.schema.SchemaPlus schema)
protected boolean	shouldVisitTable(String schemaName, String tableName, org.apache.calcite.schema.Schema.TableType tableType)
boolean	visitCatalog() Visit the catalog.
void	visitField(String schemaName, String tableName, org.apache.calcite.rel.type.RelDataTypeField field) Visit the given field.
boolean	visitSchema(String schemaName, org.apache.calcite.schema.SchemaPlus schema) Visit the given schema.
boolean	visitTable(String schemaName, String tableName, org.apache.calcite.schema.Table table) Visit the given table.
void	visitTables(String schemaPath, org.apache.calcite.schema.SchemaPlus schema) Visit the tables in the given schema.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

filter

protected InfoSchemaFilter filter

optionManager

protected OptionManager optionManager

Constructor Detail

InfoSchemaRecordGenerator

public InfoSchemaRecordGenerator(OptionManager optionManager)

Method Detail

setInfoSchemaFilter

public void setInfoSchemaFilter(InfoSchemaFilter filter)

visitCatalog

public boolean visitCatalog()

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.

visitSchema

public boolean visitSchema(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.

visitTable

public boolean visitTable(String schemaName,
                 String tableName,
                 org.apache.calcite.schema.Table table)

Visit the given table.

Parameters:

schemaName - Name of the schema where the table is present

tableName - Name of the table

table - Table object

Returns:

Whether to continue exploring the contents of the table or not. Contents are fields within the table.

visitField

public void visitField(String schemaName,
              String tableName,
              org.apache.calcite.rel.type.RelDataTypeField field)

Visit the given field.

Parameters:

schemaName - Schema where the table of the field is present

tableName - Table name

field - Field object

shouldVisitCatalog

protected boolean shouldVisitCatalog()

shouldVisitSchema

protected boolean shouldVisitSchema(String schemaName,
                        org.apache.calcite.schema.SchemaPlus schema)

shouldVisitTable

protected boolean shouldVisitTable(String schemaName,
                       String tableName,
                       org.apache.calcite.schema.Schema.TableType tableType)

shouldVisitColumn

protected boolean shouldVisitColumn(String schemaName,
                        String tableName,
                        String columnName)

getRecordReader

public abstract PojoRecordReader<S> getRecordReader()

scanSchema

public void scanSchema(org.apache.calcite.schema.SchemaPlus root)

visitTables

public void visitTables(String schemaPath,
               org.apache.calcite.schema.SchemaPlus schema)

Visit the tables in the given schema. The

Parameters:

schemaPath - the path to the given schema

schema - the given schema