t8y2--dbx/plugins/dialects/h2.yaml

dialect:
  name: "H2"
  display_name: "H2"
  versions:
    - version: "2"
      status: "RECOMMENDED"

types:
  - name: "TINYINT"
    category: "INTEGER"
  - name: "SMALLINT"
    category: "INTEGER"
  - name: "INT"
    category: "INTEGER"
    aliases: ["INTEGER", "MEDIUMINT"]
  - name: "BIGINT"
    category: "INTEGER"
  - name: "IDENTITY"
    category: "INTEGER"
  - name: "DECIMAL"
    category: "DECIMAL"
    has_precision: true
    aliases: ["NUMERIC", "DEC", "NUMBER"]
  - name: "DOUBLE"
    category: "FLOAT"
    aliases: ["DOUBLE PRECISION", "FLOAT", "FLOAT8"]
  - name: "REAL"
    category: "FLOAT"
    aliases: ["FLOAT4"]
  - name: "TIME"
    category: "TIME"
  - name: "DATE"
    category: "DATE"
  - name: "TIMESTAMP"
    category: "DATETIME"
    aliases: ["DATETIME"]
  - name: "TIMESTAMP WITH TIME ZONE"
    category: "DATETIME"
    semantic_fidelity_base: 0.9
  - name: "VARCHAR"
    category: "STRING"
    has_length: true
    aliases: ["LONGVARCHAR", "VARCHAR2", "NVARCHAR", "NVARCHAR2", "VARCHAR_CASESENSITIVE"]
  - name: "CHAR"
    category: "STRING"
    has_length: true
    aliases: ["CHARACTER", "NCHAR"]
  - name: "CLOB"
    category: "STRING"
  - name: "BLOB"
    category: "BINARY"
    aliases: ["LONGVARBINARY", "IMAGE", "TINYBLOB", "MEDIUMBLOB", "LONGBLOB"]
  - name: "BINARY"
    category: "BINARY"
    has_length: true
    aliases: ["VARBINARY", "RAW"]
  - name: "BOOLEAN"
    category: "BOOLEAN"
    aliases: ["BOOL", "BIT"]
  - name: "UUID"
    category: "UUID"
  - name: "ARRAY"
    category: "ARRAY"
    semantic_fidelity_base: 0.5
  - name: "GEOMETRY"
    category: "SPATIAL"
  - name: "JSON"
    category: "JSON"
  - name: "ENUM"
    category: "ENUM"
  - name: "INTERVAL"
    category: "INTERVAL"
    semantic_fidelity_base: 0.6

ddl_capabilities:
  add_column: true
  drop_column: true
  rename_column: true
  alter_column_type: true
  comment: true
  create_index: true
  drop_index: true
  rebuild_index: true
  create_table: true
  drop_table: true
  truncate_table: true
  create_trigger: true
  drop_trigger: true
  create_function: true
  drop_function: true
  if_not_exists: true
  temporary_table: true
  identity_columns: true
  templates:
    add_column: "ALTER TABLE {table} ADD COLUMN {column} {type}"
    drop_column: "ALTER TABLE {table} DROP COLUMN {column}"
    rename_column: "ALTER TABLE {table} ALTER COLUMN {old} RENAME TO {new}"
    modify_column: "ALTER TABLE {table} ALTER COLUMN {column} {type}"
    create_table: "CREATE TABLE IF NOT EXISTS {table} ({columns})"
    drop_table: "DROP TABLE IF EXISTS {table}"
    create_index: "CREATE INDEX IF NOT EXISTS {name} ON {table} ({columns})"
    drop_index: "DROP INDEX IF EXISTS {name}"

rollback_templates:
  add_column: "ALTER TABLE {table} DROP COLUMN {column}"
  drop_column: "ALTER TABLE {table} ADD COLUMN {column} {original_type}"
  rename_column: "ALTER TABLE {table} ALTER COLUMN {new} RENAME TO {old}"
  modify_column: "ALTER TABLE {table} ALTER COLUMN {column} {original_type}"
  create_table: "DROP TABLE IF EXISTS {table}"
  drop_table: "-- Restore from backup: {table}"

online_safety:
  add_column:
    level: "BLOCKING_SHORT"
    cost: "LOW"
  modify_column:
    level: "BLOCKING_SHORT"
    cost: "LOW"
  drop_table:
    level: "REQUIRES_GHOST"
    cost: "HIGH"
  truncate:
    level: "REQUIRES_GHOST"
    cost: "HIGH"

destruction_level:
  drop_table: "FATAL"
  truncate: "DANGEROUS"
  drop_column: "DANGEROUS"
  alter_type: "MODIFY"
  add_column: "SAFE"
  create_table: "SAFE"

structural_capabilities:
  supports_schemas: true
  max_columns_per_table: 1600
  max_indexes_per_table: 100
  max_query_size_bytes: 131072
  max_foreign_key_name_length: 256
  supports_full_text_index: true
  supports_spatial_index: true
  supports_on_update_cascade: true
  supports_on_delete_set_null: true
  supports_deferrable_constraints: true
  supports_json_type: true
  supports_uuid_type: true
  supports_sequences: true

identifier_rules:
  quote_char: '"'
  case_sensitive: false
  max_length: 256

metadata_queries:
  list_tables:
    sql: "SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = '{schema}' AND TABLE_TYPE = 'BASE TABLE'"
    performance_profile: "LIGHT"
  list_columns:
    sql: "SELECT COLUMN_NAME, DATA_TYPE, IS_NULLABLE, COLUMN_DEFAULT FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = '{schema}' AND TABLE_NAME = '{table}' ORDER BY ORDINAL_POSITION"
    performance_profile: "MEDIUM"
  list_indexes:
    sql: "SELECT INDEX_NAME, COLUMN_NAME FROM INFORMATION_SCHEMA.INDEXES WHERE TABLE_SCHEMA = '{schema}' AND TABLE_NAME = '{table}'"
    performance_profile: "MEDIUM"
  list_foreign_keys:
    sql: "SELECT CONSTRAINT_NAME, COLUMN_NAME, REFERENCED_TABLE_NAME, REFERENCED_COLUMN_NAME FROM INFORMATION_SCHEMA.CROSS_REFERENCES WHERE PKTABLE_SCHEMA = '{schema}' AND FKTABLE_NAME = '{table}'"
    performance_profile: "MEDIUM"
  dependencies:
    sql: "SELECT FKTABLE_NAME AS table_name, PKTABLE_NAME AS ref_table FROM INFORMATION_SCHEMA.CROSS_REFERENCES WHERE PKTABLE_SCHEMA = '{schema}'"
    depth_support: 2
    performance_profile: "MEDIUM"