singhpk234 commented on code in PR #13879:
URL: https://github.com/apache/iceberg/pull/13879#discussion_r2594502240
##########
open-api/rest-catalog-open-api.yaml:
##########
@@ -3265,6 +3265,104 @@ components:
additionalProperties:
type: string
+ ReadRestrictions:
+ type: object
+ description: >
+ Read restrictions for a table, including column projections and row
filter expressions.
+
+ A client MUST enforce the restrictions defined in this object when
reading data
+ from the table.
+
+ These restrictions apply only to the authenticated principal, user,
or account
+ associated with the request. They MUST NOT be interpreted as global
policy and
+ MUST NOT be applied beyond the entity identified by the
Authentication header
+ (or other applicable authentication mechanism).
+ properties:
+ required-column-projections:
+ description: >
+ A list of projections that MUST be applied prior to any
query-specified
+ projections.
+ If this property is absent, no mandatory projection applies,
+ and a reader MAY project any subset of columns of the table,
including all columns.
+
+ 1. A reader MUST project only columns listed in the
required-column-projections.
+ - If a listed column has a transform, the reader MUST apply it
and replace
+ all references to the underlying column with the transformed
value
+ (for example, truncate[4](cc) MUST be projected as
truncate[4](cc) AS cc,
+ and all references to cc during query evaluation post applying
required-row-filter MUST resolve to this alias).
+ - Columns not listed in the required-column-projections MUST NOT
be read.
+
+ 2. A column MUST appear at most once in the
required-column-projections.
+
+ 3. If a projected column's corresponding entry includes an action
that the reader cannot evaluate,
+ the reader MUST fail rather than ignore the transform.
+
+ 4. An identity transform is equivalent to projecting the column
directly.
+
+ 5. The data type of the projected column MUST match the data type
defined for the transform result.
+
+ type: array
+ items:
+ $ref: '#/components/schemas/Projection'
+ required-row-filter:
+ description: >
+ An expression that filters rows in the table that the
authenticated principal does not have access to.
+
+ 1. A reader MUST discard any row for which the filter evaluates to
false or null, and
+ no information derived from discarded rows MAY be included in
the query result.
+
+ 2. Row filters MUST be evaluated against the original,
untransformed column values.
+ Required projections MUST be applied only after row filters are
applied.
+
+ 3. If a client cannot interpret or evaluate a provided filter
expression, it MUST fail.
+
+ 4. If this property is absent, null, or always true then no
mandatory filtering is required.
+ $ref: '#/components/schemas/Expression'
+
+ Projection:
+ type: object
+ description: Defines a projection for a column.
+ properties:
+ field-id:
+ type: integer
+ description: field id of the column being projected.
+ action:
+ $ref: '#/components/schemas/Action'
+ required:
+ - field-id
+ - action
+
+ Action:
+ description: Defines the specific action to be executed for computing
the projection.
+ oneOf:
+ - $ref: '#/components/schemas/MaskHashSha256'
+ - $ref: '#/components/schemas/ReplaceWithNull'
+ - $ref: '#/components/schemas/MaskAlphanumeric'
+ - $ref: '#/components/schemas/ApplyTransform'
+
+ MaskHashSha256:
+ description: |
+ Mask the data of the column by applying SHA-256.
+ The input must be UTF-8 encoded bytes of the column value.
+ The SHA-256 digest is represented as a lowercase hexadecimal string.
+ Engines must follow this procedure to ensure consistency:
+ 1. Convert the column value to a UTF-8 byte array.
+ 2. Apply the SHA-256 algorithm as specified in NIST FIPS 180-4.
+ 3. Convert the resulting 32-byte digest to a 64-character lowercase
hexadecimal string.
+
+ ReplaceWithNull:
Review Comment:
Added : https://github.com/apache/iceberg/pull/14778
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