org.apache.drill.exec.record.metadata.schema

Interface SchemaProvider

All Known Implementing Classes:

FsMetastoreSchemaProvider, InlineSchemaProvider, PathSchemaProvider

public interface SchemaProvider

Provides mechanisms to manage schema: store / read / delete.

Field Summary

Fields

Modifier and Type	Field and Description
static String	DEFAULT_SCHEMA_NAME Default schema file name where schema is stored on file system.

Method Summary

Modifier and Type	Method and Description
void	delete() Deletes schema.
boolean	exists() Checks if schema exists.
SchemaContainer	read() Reads schema into SchemaContainer.
void	store(String schema, Map<String,String> properties, StorageProperties storageProperties) Stores given schema definition and properties.

Field Detail

DEFAULT_SCHEMA_NAME

static final String DEFAULT_SCHEMA_NAME

Default schema file name where schema is stored on file system. File is hidden to avoid including it when reading table data.

See Also:

Constant Field Values

Method Detail

delete

void delete()
     throws IOException

Deletes schema.

Throws:

IOException

store

void store(String schema,
           Map<String,String> properties,
           StorageProperties storageProperties)
    throws IOException

Stores given schema definition and properties.

Parameters:

schema - schema definition

properties - map of properties

storageProperties - storage properties

Throws:

IOException

read

SchemaContainer read()
              throws IOException

Reads schema into SchemaContainer. Depending on implementation, can read from a file or from the given input.

Returns:

table schema instance

Throws:

IOException

exists

boolean exists()
        throws IOException

Checks if schema exists.

Returns:

true if schema exists, false otherwise

Throws:

IOException